Plans for the McGurk Detective Organization's First Annual Open House go awry when a diabolical saboteur sets out to discredit the team.

On the basis of a clue found in a library book, the McGurk detectives search for the perpetrator and victim of a crime they think will be committed in three days.

The McGurk organization must act to prevent a crime--but they don't know what the crime will be.

The McGurk Organization's four young detectives match wits with a nine-year-old scientific genius to unravel the mystery of the "invisible dog".

Ten-year-old Jack McGurk and his fellow detectives match wits with the local police as they track down a runaway newsboy.

The McGurk Dective Organization joins forces with the FBI to capture a bank robber.