The Best Wadsworth Camp Mysteries

Sinister Island – Miller ignores the warning about visiting a haunted island and soon mysterious things begin to occur with his friends.
The Abandoned Room – Bobby Brown's grandfather is murdered and no one knows how did the killer enter the locked room?
The Gray Mask – Detective Garth and his daughter Nora are supernatural mystery hunter and on a mission to find schemers and hoaxers.
The Signal Tower – Tolliver has to teach his colleague and former lodger Joe a lesson when he begins to harass his wife and son.

Charles Wadsworth Camp (1879–1936) was an American author, best remembered for his mysteries. He is father of the celebrated author Madeleine L'Engle. Some of his works were also adapted into films.