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Threshold


CoverWhen the strange fossil she'd discovered had ended up giving her a trip to Mars, Helen Sutter thought she'd gone about as far as any paleontologist would ever go in her lifetime. But when you've also married A.J. Baker, overconfident super- sensor expert for the only private agency in space—the Ares Corporation—and your best friend Madeline Fathom Buckley is a former secret agent who's just signed on as the chief of security for the newly created and already embattled Interplanetary Research Institute of the United Nations, there's always somewhere farther to go.

The newest discoveries will take her, A.J., and their friends Jackie, Joe, and Madeline to the mysterious asteroid Ceres—and beyond, in a desperate race to Jupiter's perilous miniature system of radiation- bombarded moons. The next gold rush is on—for alien technology, hidden in lost bases around the system. And there are people willing to do anything to get it—even plan the first interplanetary war, four hundred million miles from home!

Cover Art by Bob Eggleton
Interior Illustrations by Keith Morrison


ORDER Hardcover
This is a work of fiction. All the characters and events portrayed in this book are fictional, and any resemblance to real people or incidents is purely coincidental.

First printing, June 2010

Distributed by Simon & Schuster
1230 Avenue of the Americas
New York, NY 10020

Printed in the United States of America

ISBN-13: 978-1-4391-3360-6
ISBN-10: 1-4391-3360-3

Copyright© 2010 by Eric Flint & Ryk E. Spoor

All rights reserved, including the right to reproduce this book or portions thereof in any form.

Baen Publishing Enterprises
P.O. Box 1188
Wake Forest, NC 27588
https://www.baen.com

Electronic version by Baen Books
https://www.baen.com


Baen Books By Ryk Spoor

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Eric Flint's Bestselling Ring of Fire series

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1634: The Baltic War with David Weber
1634: The Galileo Affair with Andrew Dennis
1634: The Ram Rebellion with Virginia DeMarce et al.
1634: The Bavarian Crisis with Virginia DeMarce
1635: The Cannon Law with Andrew Dennis
1635: The Dreeson Incident with Virginia DeMarce
1635: The Tangled Web by Virginia DeMarce
1635: The Eastern Front (forthcoming)
Ring of Fire ed. by Eric Flint
Ring of Fire II ed. by Eric Flint
Grantville Gazette ed. by Eric Flint
Grantville Gazette II ed. by Eric Flint
Grantville Gazette III ed. by Eric Flint
Grantville Gazette IV ed. by Eric Flint
Grantville Gazette V ed. by Eric Flint
Grantville Gazette VI ed. by Eric Flint

For a complete list of Baen Books by Eric Flint, please go to www.baen.com

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