The stooges are private detectives hired to find a missing girl. The boys disguise as pie salesmen and end up wandering around a mad scientist's mansion, trying to find the girl. The boys confront a gorilla and various other bad guys, before rescuing the girl.
| Actor | Role |
|---|---|
 Shemp HowardShemp | Shemp |
 Larry FineLarry | Larry |
 Moe HowardMoe | Moe |
| NNorma RandallMary Bopper | Mary Bopper |
 Philip Van ZandtDr. Jeckyl | Dr. Jeckyl |
 Tom KennedyMr. Hyde | Mr. Hyde |
| SSteve CalvertGorilla (uncredited) | Gorilla (uncredited) |
 Frank MitchellGeorge B. Bopper (uncredited) | George B. Bopper (uncredited) |