Bedtime story

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.