The Hardy Boys/Nancy Drew Mysteries

Frank and Joe investigate a place where people allegedly disappear, never to be seen again.

Nancy Drew and her girlfriend, George, see an automobile run off the road, but the sheriff tells her that the road has long been closed and there is no trace of the accident.

A man who vanishes, a flying saucer and a floor that collapses all confound Frank and Joe.

A burglary at her home leads Nancy Drew to investigate her aunt's attempt to sell their farm, which someone is apparently trying to make them believe is haunted.

When Nancy stages a benefit play, the cast is plagued by frightening accidents.

Nancy and her friends are at a benefit performance at a carnival when they witness a jewel robbery. Suspecting a gang of bikers, Nancy goes undercover as a runaway who wants to join the carnival.