Two dubious characters disguise themselves as Holmes and Watson to gain attention and end up chasing counterfeiters and stolen stamps.

Hans Albers
as Sherlock Holmes / Morris Flint

Heinz Rühmann
as Dr. John H. Watson / Macky McPherson

Marieluise Claudius
as Mary Berry

Hansi Knoteck
as Jane Berry

Günther Ballier
as 1. Kriminalbeamter

Ernst Behmer
as Conductor

Paul Bildt
as Sir Arthur Conan Doyle

Harry Hardt
as Billy

Ernst Waldow
as Hoteldetektiv

Eduard von Winterstein
as Richter