The Three Investigators Mystery Series

Hired to discover why a wild-animal farm's tame lion has become unpredictably nervous, three young detectives begin an investigation that uncovers a smuggling operation.

The sighting of a UFO leads the Three Investigators to uncover a bizarre confidence game.

A statue of a mermaid proves to be a vital clue when the three investigators set out to trace a missing child.

While accompanying Pete's inventor grandfather to New York where the old man plans to sell his new invention, the Three Investigators find themselves in the middle of a dangerous spy case.

The Three Investigators foil a plot to kidnap the son of a political leader in an African colony.

When an ornery book collector disappears, the Three Investigators break into his secret computer files in search of clues and gradually uncover his mysterious past.

When three junior detectives search for a valuable old Spanish sword lost since the Mexican War, the headless statue of a horse yields a clue.

An old trunk involves the three investigators with dangerous criminals seeking a cache of stolen money.

Three young detectives try to trap an invisible vandal who has been breaking car windows all over town.

While attending a week-long family reunion on a California island, the Three Investigators find their photographs of the event hold an inordinate interest for someone else, and receive clues to that unknown identity from both an ancient and a modern boating accident.

Searching for a legendary pirate treasure, the three investigators find a band of modern day pirates.

Three young sleuths uncover a coven of witches when they search for the missing memoirs of a movie star.

A wallet dropped by a scar-faced beggar sets the three investigators on the trail of bank robbers.

Three young detectives search for a stolen statue only to find that it has mysteriously come to life.

The three young sleuths solve a case of double identity while investigating the legend of Monster Mountain.

The Three Investigators search for a stolen statue only to find that it has mysteriously come to life.

Three young sleuths uncover a mystery buried since World War II when they come to the aid of a trouble-plagued environmentalist who is protesting the drilling of off-shore oil wells.

The Three Investigators tangle with a couple of shady producers of horror films when they try to track down a runaway teenager.