An architect (Chick Chandler) studies the doors of six shops and an apartment house to solve a gem theft/double murder.
| Actor | Role |
|---|---|
 Chick ChandlerJimmy McMillan | Jimmy McMillan |
 June ClydeMary Rawling | Mary Rawling |
 George MeekerCharles Eaton | Charles Eaton |
| MMichael RaffettoCapt. Wm. Jaffe | Capt. Wm. Jaffe |
 Gregory GayeHenry Butler aka Gregor (as Gregory Gay) | Henry Butler aka Gregor (as Gregory Gay) |
 Edgar DearingClaude Burns | Claude Burns |
 Rebel RandallMable De Rose | Mable De Rose |
| MMilton WallaceDonald Adams | Donald Adams |
| CCasey MacGregorTimothy Green | Timothy Green |
 Gene RothDetective Morgan (uncredited) | Detective Morgan (uncredited) |