The fifteen-year-old Murry twins, Sandy and Dennys, are accidentally sent back to a strange Biblical time period, in which mythical beasts roam the desert and a man named Noah is building a boat in preparation for a great flood.

Artemis's mother has contracted a deadly disease -- and the only cure lies in the brain fluid of African lemurs. Unfortunately, Artemis himself was responsible for making the lemurs extinct five years ago. Now he must enlist the aid of his fairy friends to travel back in time and save them. Not only that, but he must face his deadliest foe yet...his younger self.

Mac is stunned to discover that her sister's murder had been far more than a random act of violence and resents the awakening of a mysterious ability to sense the Fae and their talismans, a talent that sends her on a quest to find the Sinsar Dubh, a mystical book of dark power, and to insure that it cannot fall into the wrong hands.