The Mystery of the Whispering Mummy

The MYSTERY Of The FIERY EYE (Alfred Hitchock and the Three Investigators) #7

The Secret Lake

The Secret of Moon Castle

Mr Penguin and the Lost Treasure

The Secret Warning

Secret Seven on the Trail

The Haunted Showboat

Three teenage boys solve mysteries using their intelligence, resourcefulness, and keen observation skills.

The Three Investigators

In 'The Secret of Skeleton Island', three 'Jupiter', 'Pete', and 'Bob', friends and associates, investigate strange occurrences and unexplained happenings around Skeleton Island. The island holds an ancient mystery of treasure and deadly curses which the boys must navigate through and solve to save themselves and their town.

Discover Your Child's Next Read

The Mystery of the Whispering Mummy

Robert Arthur, 1965

The MYSTERY Of The FIERY EYE (Alfred Hitchock and the Three Investigators) #7

Robert Arthur, Harry Kane, 1967

The Secret Lake

Karen Inglis, 2011

The Secret of Moon Castle

Enid Blyton, 1953

Mr Penguin and the Lost Treasure

Alex T. Smith, Alice Delarbre, 2017

The Secret Warning

Franklin W. Dixon, 1938

Secret Seven on the Trail

Enid Blyton, 1993

The Haunted Showboat

Carolyn Keene, 1957