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“So why are you turning my shop into a mess this time?” Stephanie’s dad inquired politely, leaning against his basement workshop’s doorframe with a cup of coffee in one hand. His tone was one of weary resignation, but a laugh lurked in its depths, and Stephanie looked over her shoulder at him with a smile.

“I’ve been thinking about what Mom said about the celery thieves,” she replied.

She opened one of his neatly labeled drawers and found the circuit chip she wanted. She also checked to make sure there was still at least one more t-chip in the drawer—one of the conditions for her free use of her father’s tools and supplies was that she help keep track of inventory and tell him when it was time to reorder items—then turned back to the chassis of the device she was building.

“And that thinking led you to a conclusion which explains all this?” her father asked, raising an eyebrow and waving his coffee cup at the contraptions taking shape on the workbench.

“Well,” Stephanie paused and turned around to face him fully, “in a way. It all seemed pretty silly right at first, of course. I mean, celery?” She rolled her eyes, and Richard snorted a laugh. Celery wasn’t very high on Stephanie’s list of edible foods. She’d eat it under parental duress (and if there was nothing better around) but that was about it. “Besides, according to all the reports, only a head or two at a time was taking missing, and who’d go to all that bother to steal that teeny an amount, right?”

“I can see where those thoughts might have occurred to you,” he conceded.

It had been almost a full T-year since a mounting number of settlers had reported vanishing crops, but in the beginning, most people had been inclined to think it was some kind of hoax, especially since the only plant that was ever stolen was celery. And since, as Stephanie said, so few heads of celery were going missing each time the “thieves” struck.

“The first thing I thought when Mom told me about it was that some zork-brain was probably stealing the stuff and hiding it somewhere—or just getting rid of it, for that matter—as some kind of joke,” Stephanie continued. “It wouldn’t be any dumber than some of the other stuff I’ve seen kids in Twin Forks pull. In fact, it’d be less dumb than a lot of it!”

“You know,” her father said after a moment, “not all the kids in Twin Forks are idiots, Steph.”

“I didn’t say they were,” Stephanie replied. There might have been just a hint of insincerity in her response. “They sure act that way sometimes, though, don’t they?”

“Not all of them,” he said. “Still, I’ll grant you that some of them do. Like that young hoodlum Chang.”

“Stan Chang?” Stephanie cocked her head, surprised at the noted genuine anger in her father’s tone. It was unusual for her mild-mannered parent, and so was the curtness of his nod. “What did he do this time?” she asked a bit cautiously.

“He says he only meant it as a ‘joke,’ and that’s his father’s view of it, too,” her father said. “It wasn’t very funny for Ms. Steinman’s Rottweiler, though. He set up a booby trap that was ‘only’ supposed to dump a five liter bucket of cold water on whoever walked into it. I guess we’re all lucky it was Brutus and not another kid.”

“How bad was it?” This time Stephanie’s tone was resigned, not cautious.

“Let’s just say he’s not a very good carpenter, and the entire contraption collapsed when Brutus walked into it.” Her father shook his head, his expression more resigned and sad than angry this time. “The whole thing came down on him. It crushed his entire right foreleg and he was trapped for over forty-five minutes before we could get him out. I spent better than two hours putting it back together again, and I’m not sure he’s ever going to recover fully.”

Stephanie nodded slowly. Her father cared—a lot—about his patients. Like he’d often said, they didn’t have voices, so they couldn’t explain what was wrong. And people couldn’t explain it to them, either. No wonder she’d heard so much anger in his voice.

“I’ll bet he wasn’t real sorry about it, either, was he?” she said after a moment, and her father laughed harshly.

“Not so you’d notice,” he agreed. “After all, Brutus is only an animal, right? And like Stan said, it’s not like he got killed, is it?”

The two of them looked at one another for a moment, and Stephanie felt a warm surge of affection. It was so typical of her dad to take the dog’s side, and she wondered just how her father’s conversation with Stan’s father might have gone. Under the circumstances, she was pretty darned sure there’d been one, at any rate!

Wish I could have been a fly on that wall, she thought with a mental smile. I bet the sparks were just crackling off Dad’s hair!

“Well, I guess Stan’s just proved they can do things dumber than stealing celery,” she said out loud, winning an unwilling smile from her father. “But I did think at first that it was probably somebody stealing it because they thought it’d be funny to watch people run around in circles trying to figure out what was going on. Only then I did a search for every report about missing celery and plotted all of them on a map, and they’re spread so wide every kid on the planet would have to be in on it!”

“You know,” her father said, “when your mom mentioned this to me, it never even occurred to me to think about mapping them to see how widespread it actually was.” He gave her a smile. “Of course, given my general all-around brilliance no doubt it would have occurred to me if I’d given the matter any serious thought.”

“Yeah, sure,” Stephanie said, rolling her eyes.

“It was a good notion, though,” he said more seriously. “That puzzle-solver side of you coming to the surface again, I see.”

“I guess,” Stephanie agreed. “And you’re not the only one who hasn’t given it any ‘serious thought,’ either. It doesn’t look like most people have noticed it at all. In fact, I wouldn’t have if the farmers who’ve been losing the stuff weren’t part of Mom’s genegineering program.”

Her lip curled, and her father tried to stifle his sigh.

Her father nodded thoughtfully.

Celery was one of the terrestrial plants which hadn’t adapted well to the local planetary environment, and Stephanie’s mom had taken over the project trying to do something about that. She’d had to restart it almost from zero, unfortunately, because the geneticist who’d originally started it had been one of victims of the Plague’s final resurgence. In the end, she’d come up with an entirely new approach that was in the field test stage now, and the farmers’ reports she was reading to assess its effectiveness were where she’d first heard about the mysterious thefts. None of the thefts had been very big, and they had been scattered pretty widely.

“They do cluster, though,” Stephanie said, turning back to one of the contraptions on the workbench. “It’s like there are maybe four or five areas where the celery’s getting pinched, but there’s an awful lot of separation between those areas. And I’m not sure it really started as recently as people seem to think it did, either.”

“No?” Richard raised his eyebrows.

“People have had a lot on their minds, Daddy. First they were dealing with the Plague and just trying to stay alive, and since then everybody’s been crazy busy trying to put everything back together again. I wouldn’t be too surprised if a whole bunch of little, tiny ‘celery raids’ didn’t just go completely unnoticed in the middle of all that, especially if whoever it is was just snatching them out of the field. I think the only reason anyone’s noticed even now is that the stuff’s been disappearing out of greenhouses during the winter months. Who knows how much of it might’ve gotten snatched out of outdoor gardens during the summer without anyone even noticing?”

“Point,” he acknowledged.

“The thing is, though,” she went on, “that however recently it started, it’s not happening in just one place and nobody’s been able to catch whoever’s doing it.”

“How hard have they tried?” he asked.

“Wellll . . .”

Stephanie looked up, forehead creased with thought as she considered the best way to answer her father’s question. To her way of thinking, there was a difference between “how hard” and “how effectively” (or “how intelligently,” for that matter). That wasn’t exactly what he’d asked, though, and she shrugged.

“I think at first most people figured it was kids,” she said, “and it’s not like the amount of celery that’s being taken is really hurting anyone that much. I mean, it’s only celery, and it’s not like there’s a big market for stolen celery, right? So the truth is, no one put a whole lot of effort into it at first. Like I said, they’ve had other things to worry about.

“But it looks like whoever—or whatever—is behind it is starting to take more of it, and I think at least some people are worried the thieves might start branching out into stuff besides celery. Besides, like Mom says, an awful lot of it seems to be being taken out of the experimental greenhouses. In fact it looks like most of the reported incidents—the ones where people have actually noticed the celery disappearing—are coming out of the experimental plots. And if that keeps up or spreads to some of the other experimental farms’ plots, it could screw up some of the long-term research projects. So in the last few T-months, people have been getting more serious about figuring out what’s going on and stopping it. Besides, it’s a challenge!”

“Getting more serious?” her dad repeated, and she shrugged.

“Well, they started out simple. Given where the celery’s been disappearing from, most people figure whatever’s taking it can’t be too big, since it would have to squeeze into some pretty narrow places. A couple of people suggested setting traps, but the Forestry Service knocked that one on the head in a hurry because of the Elysian Rule.”

Her expression sobered, and so did her father’s. The Elysian Rule had been adopted over a thousand years before, after a disastrous clutch of mistakes had devastated the ecology of the colony world of Elysian. It absolutely forbade the use of lethal measures against a complete unknown without evidence that whatever it was posed a clear physical danger to humans, and no administration on a planet in the early stages of settlement would even consider its violation without a reason far more compelling than the minuscule economic loss thefts of celery represented.

“Since we don’t know what’s actually taking the celery, we can’t be sure how to set a nonlethal trap for it,” Stephanie said. “That didn’t keep some people from wanting to go ahead with traps, anyway, but Chief Ranger Shelton wasn’t about to let them get away with that!”

She grinned in obvious approval of the chief ranger’s stance, then continued.

“So they tried alarms and sensors. Since everybody figures we’re dealing with some sort of local critter, they decided to try simple tripwires connected to lights and remote cameras first, but that didn’t work. Whatever is actually snatching the stuff, either it doesn’t spend a lot of time on the ground or else it’s really good at spotting tripwires.”

She paused, brown eyes narrowed thoughtfully, then looked back at her father.

“I think they’re right that it’s probably something local. Something small, I bet, and really, really sneaky. But what I can’t figure out, is why something from Sphinx would be eating celery of all things.”

“I can think of several possible reasons,” her father replied. “Don’t forget, one of the things that made the Manticore System so attractive to colonists despite Sphinx’s gravity is how similar all three if its planetary biosystems are to the one humanity evolved in.” His eyes darkened. “That’s probably the only reason the Plague could evolve in it and hit us so hard.”

He paused for a moment, then gave himself an almost apologetic shake and continued.

“Both Manticore and Sphinx use the same sugars our biochemistry does, and the local amino acids are pretty similar, as well. Sphinxian genes and chromosomes are actually a lot like terrestrial ones, too. I’m speaking in a general sense, of course, because there are at least as many differences as similarities. For example, the Sphinx equivalent of RNA forms double strands, not single, and it forms longer chains than anything we’ve found in terrestrial biology. Humans and the critters we tend to take with us when we colonize planets can eat Sphinxian plants and animals just fine, though—it just doesn’t give us everything we need, like most of the essential vitamins, so we have to supplement it. Which is one reason your mom and I fuss at you about eating your vegetables, now isn’t it?”

He glowered at her, and she grinned again.

“Anyway, my point is that there are quite a few things growing here on Sphinx that humans have decided are tasty. We like the way they taste, even if they don’t have all the food values we need. So I don’t see any reason to assume some Sphinxian animal wouldn’t find celery a real delicacy.”

“Um.” Stephanie considered that for a moment, then shrugged. “Okay, I guess I can see that. Although the thought that anyone would feel that way about celery is kind of hard to accept.

“But what I was saying is that whatever it is, it’s small and sneaky, and it doesn’t go anywhere near tripwires. So they decided to try motion sensors, but that didn’t work too well, either. There are so many small critters running around Sphinx, like the chipmunks, that the motion sensors kept going off all the time. They tried dialing their sensitivity down, so they’d only go off for something bigger than a chipmunk, but then whatever’s stealing the celery started getting past them again. So then they tried setting infrared barriers just around the greenhouses themselves, but that isn’t working either.”

“I thought I remembered reading somewhere that at least a couple of alarms had gone off,” her father said thoughtfully, and she nodded.

“Yes, but whatever’s behind this, it seems to like bad weather. My data search couldn’t nail down the weather conditions when all the robberies took place. For one thing, sometimes the people filing the report couldn’t pin down the time any closer than a day or two. I mean, most people have better things to do than stand around in a greenhouse counting celery plants to make sure none of ’em have disappeared. No wonder they don’t always notice immediately when one of them takes missing! But almost all the raids I could check the weather on took place when it was snowing, or during a thunderstorm, or at least when it was raining pretty heavily even for Sphinx. And all of them—all the ones I could nail down, at least—happened at night, too.”

“So whatever it is, it’s probably nocturnal, and it only comes out when it rains or snows? It’s smart enough to use bad weather for cover?”

“That’s what it looks like to me, anyway.”

“And would it happen that you’ve shared this particular insight with any of the other investigators trying to figure out what’s going on?” her father inquired politely.

“Gosh!” Stephanie widened her eyes at him. “I guess it must’ve slipped my mind, somehow.”

“That’s what I thought.” Her father shook his head with a long-suffering expression, and Stephanie laughed.

“Anyway,” she continued, “they have had a couple of cameras go off, and something tripped the alarms on one of the experimental farms over in Long Grass, but the weather was so bad they didn’t get anything. Well, one of the cameras in Seaview got some really nice holos of snowflakes, but that wasn’t much use. All of them were motion sensor-controlled, but with no pictures, all anyone’s really sure about was that it was bigger than a chipmunk because that’s where the filters were set.”

Her dad nodded in understanding. Sphinxian “chipmunks” didn’t look a lot like Meyerdahl’s (or, for that matter, Old Terra’s) chipmunks, although they filled much the same ecological niche. The burrow-dwelling marsupials were six-limbed and only a very little smaller than a terrestrial Chihuahua, and they were about as ubiquitous as a species got. Fortunately, they were also timid, unlike their slightly smaller arboreal cousin, the equally ubiquitous (and much more destructive) wood rat.

“But the thing I noticed about all of those,” Stephanie went on in a satisfied tone, “was that even when one of the motion sensor alarms was set off, the celery thief still got through and got away with his celery without setting off any of the infrared alarms closer to the greenhouses themselves.”

She paused, looking at her father expectantly, and he took a thoughtful sip of coffee, then nodded.

“You’re thinking about what you and I discussed a couple of weeks ago, aren’t you, Steph?” he said with a smile of approval.

“Yep.” Stephanie smiled back at him. “I remembered what you said about that report about wood rats’ eyes. If Dr. Weyerhaeuser’s right and they do use a lot more of the lower end of the spectrum than human eyes do, then something like a wood rat might be able to actually see an infrared beam and stay out of it.” Her smile turned into a grin. “You’re always telling me to analyze a problem carefully before I jump into trying to solve it. Sounds to me like some other people should have been taking your advice, too!”

“Well, let’s be fair here, Steph. Dr. Weyerhaeuser’s report only came out in October. It’s not like people have had a long time to think about it or put two and two together yet for something like this.”

She nodded in agreement, but she’d also heard the approval in his voice for the way she’d put “two and two together.”

“Anyway,” she went on, waving at the partially assembled hardware spread down the workbench’s length, “what I’m doing is putting together some ultraviolet sensors. We’ve got Mom’s experimental greenhouse right here, and she’s got some of the celery from that genetic development program growing in it. I figure we’ve already got the bait, so maybe we should try the other end of the spectrum and see if we don’t get a little bit luckier than the folks in Long Grass and Seaview.” She gave him her very best wheedling smile. “Wanna help?”

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