Every night novelist Christopher Knox reads to his son David from an obscure fantasy novel. One night, when David is reading the book alone, an inexplicable seizure leaves him in a mysterious state of unconsciousness. As his seizure recurs every night, his father learns that only one thing will calm it, a bedtime story from this strange new book. Both father and son are headed towards a fateful collision of worlds, and a showdown of ancient evils, both fictional and very real.