Johnny Dixon and Professor Childermass series

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 hs heirs after his own death by suicide.

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 Dixon and Professor Childermass discover a trolley which transports them back to Constantinople in 1453 as the Turks are invading the Byzantine Empire.

Their friend Father Higgins is in trouble, and it is up to Johnny and Professor Childermass to save him from the forces of evil. In this, the eighth Johnny Dixon mystery, Johnny and the professor hear word of Father Higgins being haunted, and when he disappears, clues lead them to England. There they find the priest has been possessed by Dr. Masterman, the ghost of a deranged knight bent on ruling the world. Masterman intends to reanimate the bodies...

By donating a box full of strange objects, Professor Childermass gets his young friend Johnny Dixon a summer job at the Gudge Museum. Everything seems okay as Johnny mops the floors and dusts the artifacts. That is, until a sinister man named Mattheus Mergal shows up looking for the one item the professor held back to keep safe-a wooden hand carved by the evil wizard Esdrias Blackleash. If Mergal gets the hand, he'll be able to bring back his long-dead...