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.

Originally published: New York : Farrar, Straus, Giroux, 1986.

Virtual particles and virtual unicorns -- Pelican in the wilderness -- Japheth's sister Yalith -- Grandfather Lamech and Grandfather Enoch -- Nephilim -- Adnarel and the quantum leap -- Seraphim -- Oholibamah, Japheth's wife -- Mahlah's time, Lamech's time -- Song of the stars -- Many waters cannot quench love -- Neither can the floods drown it.