Aliens who know how human beings think, how to kill us, and what things we live and die for, have left solitude as the only way to survive for Cassie. Creatures who look, move, and talk like humans roam the Earth and kill everything in their path--she can trust no one. However, when Cassie meets the beguiling Evan Walker, she may have to take a chance on companionship once again. She has little choice.