The high pitched scream produced by an alarm clock sets three boys on the complicated and dangerous trail of art thieves.

The Three Investigators become entangled in the theft of a string of rare pearls and a fraudulent scheme involving family inheritance when they try to solve the mystery of a ghost's appearance in the old Green Mansion.

In searching for a lost parrot who recites Shakespeare with a stutter, Jupiter Jones' firm of young detectives becomes involved with a missing masterpiece.

The Three Investigators search for an authentic haunted house.

Three young detectives undertake a case involving an Egyptian mummy that whispers, but only to one man.