Blackie receives a call from a friend who asks him to retrieve some money from his apartment and deliver it to him in California. Performing this good deed, he is accused of theft, but is allowed to proceed to Hollywood to help the police find a lost diamond.
| Actor | Role |
|---|---|
 Chester MorrisBoston Blackie | Boston Blackie |
 Adele MaraEve Sanders | Eve Sanders |
 Richard LaneInspector Farraday | Inspector Farraday |
 Lloyd CorriganArthur Manleder | Arthur Manleder |
 Forrest TuckerWhipper | Whipper |
 George E. StoneThe Runt | The Runt |
 Cy KendallJumbo Madigan | Jumbo Madigan |