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.

Warner Oland
as Charlie Chan

Keye Luke
as Lee Chan

Virginia Field
as Evelyn Gray

Sidney Blackmer
as Victor Karnoff

Harold Huber
as French Police Inspector

Kay Linaker
as Joan Karnoff

Robert Kent
as Gordon Chase

Edward Raquello
as Paul Savarin

George Lynn
as Al Rogers

Louis Mercier
as Taxi Driver
CinemaSerf
Multi-talented No 1. Son "Lee" (Keye Luke) has a painting being exhibited at a gallery in Paris. For reasons that are not quite clear, though, he and his sleuthing father travel from home to France via the tiny principality of Monaco, where they encounter the rather dapper police commissioner "Joube...