#2 in the popular Boundary SF adventure series.<P>When the strange fossil she'd discovered gave 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're married to an overconfident super-sensor expert for the only private agency in space – the Ares Corporation – and your best friend is a former secret agent for the Interplanetary Research Institute of the United Nations, there's always somewhere farther to go. <P>Soon Helen's new discoveries will lead her  to the mysterious asteroid Ceres and beyond in a desperate race to reach Jupiter's perilous miniature system of radiation-bombarded moons. It seems the next gold rush is on–for alien technology.   <P>And there are people willing to do anything to get it – even if they must start the Solar System's first interplanetary war! <P><b>About the Boundary series:</b><P>“[A] genial, fast-paced sci-fi espionage thriller [that is] light in tone and hard on science…” –<I>Publishers Weekly</i> on <I>Threshold</i><P>“[P]aleontology, engineering, and space flight, puzzles in linguistics, biology, physics, and evolution further the story, as well as wacky humor, academic rivalries, and even some sweet romances.” –<I>School Library Journal</i> on <I>Boundary</i>