Molecular biologist Kaye Lang has a chilling theory: ancient diseases encoded in the DNA of humans can return to life. This theory becomes a terrifying reality when a "virus-hunter" tracks down a flu-like disease that kills expectant mothers and their offspring. As the outbreak threatens to become a deadly epidemic, Lang and Dicken must race against time to assemble the pieces of an evolutionary puzzle that will determine the future of the human race.

Will there be a future at all?