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.