Although Charlie and Lee are in Monaco for an art exhibit, they become caught up in a feud between rival financiers which involves the Chan's in a web of blackmail and murder.
| Actor | Role |
|---|---|
 Warner OlandCharlie Chan | Charlie Chan |
 Keye LukeLee Chan | Lee Chan |
 Virginia FieldEvelyn Gray | Evelyn Gray |
 Sidney BlackmerVictor Karnoff | Victor Karnoff |
 Harold HuberFrench Police Inspector | French Police Inspector |
 Kay LinakerJoan Karnoff | Joan Karnoff |
 Robert KentGordon Chase | Gordon Chase |
 Edward RaquelloPaul Savarin | Paul Savarin |
 George LynnAl Rogers | Al Rogers |
 Louis MercierTaxi Driver | Taxi Driver |
 George DavisPepito | Pepito |
 John BleiferLudwig | Ludwig |
 Georges RenaventRenault | Renault |
| GGeorge SorelGendarme | Gendarme |