Sequel to Threshold, Book Three in the best-selling Boundary series. An exploratory mission to Mars and beyond begets a rush to gain control of advanced alien technology—even if it leads to an interplanetary war. Stranded on Europa: Madeline Fathom miraculously crash lands the crippled Nebula Storm on Europa with the surviving crewmembers of an ill-fated EU vessel landing nearby. Help is most definitely not on the way. Escaping a trap of mysterious alien technology—then using it to her advantage—is Madeline's only chance to escape a very frosty demise on a very lonely moon.