The thing that wiped out the dinosaurs is about to make its comeback.It's a trillion times smaller than a killer asteroid.And it's fallen into the hands of a madman.After surviving a horrific outbreak of the Black Nile virus, epidemiologist Leigh Austen's done her best to bury memories along with the bodies.But when a call for help from the World Health Organization (WHO) arrives at her lab, she's got to face her nightmares all over again. Something's...