A pigeon with a missing toe leads three young sleuths to a group of ingenious thieves.

A hidden treasure is suspected, some criminals with a plan show up, and the Three Investigators end up right in the middle.

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

The reunion of a group of child movie stars plunges the three young detectives into a case of theft, kidnapping, and false identity.

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

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

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