To save the world from an alien invasion, humanity altered their children's genetic code--but now they're paying the price. Earth's younger generations are dying, slowly succumbing to a terrible disease...a disease without a cure.

Salvation may lie in outer space, in the DNA of humans who founded colonies before the alien attack. That is, if those settlers can be found. Planetary expeditions have turned up nothing but the debris of lost settlements--until Navohar. There, scientist Irene Olsen has stumbled upon a population that may hold the answer. If only she can uncover the truth before time runs out...