An eerie moaning sound is coming from a cave where a young bandit disappeared many years ago. Ranchers nearby figure he must still be alive. The Three Investigators set out to explore the moaning cave and soon wish they had come armed with more than a flashlight! Part of a classic series originally published beginning in 1964.

Finding a genuine haunted house for a movie set sounds like fun -- and a great way to generate publicity for the Three Investigators' new detective agency. But when the boys arrive for an overnight visit at Terror Castle -- home of a deceased horror-movie actor -- they soon find out how the place got its name!

The three investigators, attempting to rescue a beached whale, end up searching for sunken treasure.

The Three Investigators are hounded by supernatural forces as they attempt to recover a stolen sculpture of a legendary wolf-dog.

The Three Investigators are assisted by a Greek youth as they search for clues to a mysterious thief on an island once inhabited by pirates.