When a skeleton is dug up in an alley, a mysterious Chinese merchant and his eccentric upstairs tenants come under suspicion. The team of Inspector Carr and Dr. Crabtree study the skull of the victim to solve the murder.
| Actor | Role |
|---|---|
 Donald MeekDr. Crabtree | Dr. Crabtree |
 John HamiltonInspector Carr | Inspector Carr |
| JJoanna RoosAmy Beck | Amy Beck |
 Harry MestayerGrandfather Beck | Grandfather Beck |
 Paul GuilfoylePaul Beck | Paul Beck |
 Lee Tung FooWang Yun | Wang Yun |
 Maurice CassDr. David Turet (uncredited) | Dr. David Turet (uncredited) |