Charlie impersonates an employee of the U.S. government to foil an espionage plot which would destroy part of the Panama Canal, trapping a Navy fleet on its way to the Pacific after maneuvers in the Atlantic.

Sidney Toler
as Charlie Chan

Jean Rogers
as Kathi Lenesch

Lionel Atwill
as Cliveden Compton

Mary Nash
as Miss Sarah Finch

Victor Sen Yung
as Jimmy Chan

Kane Richmond
as Richard Cabot

Chris-Pin Martin
as Sergeant Montero

Lionel Royce
as Dr. Rudolph Grosser

Helen Ericson
as Stewardess

Jack La Rue
as Emil Manolo
CinemaSerf
This outing for our sleuth finds him working undercover - appropriately in a Panama hat shop - on a mission to help the US Government combat the activities of some spies bent on disrupting the movement of US Naval vessels though the Panama Canal. When a man is murdered in his shop, "Chan" is detaine...