Twelve-year old Johnny Dixon and his friend Professor Childermass look for the hidden will left by an eccentric cereal tycoon who wished to make life difficult for his heirs after his own death by suicide.
When Johnny Dixon takes a tiny skull from a haunted dollhouse, demonic forces are released, capturing Professor Childermass and leading Johnny on a harrowing chase to a deserted island off the coast of Maine.
While thirteen-year-old Johnny Dixon lies dying-- possessed by an evil spirit-- his friends, an elderly professor and a schoolmate, try to find some way to free him.
Johnny, Fergie and Professor Childermass discover an old trolley that transports them back to Constantinople in 1453 as the Turks are invading the Byzantine Empire.
Johnny Dixon, Fergie and Professor Childermass comply with a strange will left by the Professor's brother, which requires them to spend the summer at a desolate estate where they encounter a madman bent on destroying the world.
When Father Higgins disappears, Johnny Dixon and Professor Childermass discover disturbing clues which lead them to England and an encounter with a long-dead knight.
When thirteen-year-old Johnny Dixon and his friend Professor Childermass try to save the life of the elderly Dr. Coote, they find themselves facing the forces of a manacing voodoo cult.
Thirteen-year-old Johnny Dixon and his friend Professor Childermass battle an evil wizard for possession of a bewitched hand which can be used to rule the world.
When a malevolent creature tries to claim his father as its latest victim, thirteen-year-old Johnny Dixon and Professor Childermass risk their own lives trying to save him.
