Threshold

When the strange fossil she'd discovered had ended up giving her a trip toMars, Helen Sutter thought she'd gone about as far as any paleontologist wouldever go in her lifetime. But when you've also married A.J. Baker, overconfidentsuper-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 justsigned on as the chief of security for the newly created and already embattledInterplanetary Research Institute of the United Nations, there's alwayssomewhere farther to go. The newest discoveries will take her, A.J., and theirfriends Jackie, Joe, and Madeline to the mysterious asteroid Ceres, and beyond,in a desperate race to Jupiter's perilous miniature system ofradiation-bombarded moons. The next gold rush is on for alien technology, hiddenin lost bases around the system. And there are people willing to do anything toget it — even plan the first interplanetary war, four hundred millionmiles from home! The sequel to Boundary.