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

Erich Dunskus as Lippert

Hilde Weissner as Madame Ganymare

Ernst Legal as Dieter Jean

Siegfried Schürenberg as Gangsterboß Lapin

F. W. Schröder-Schrom as Polizeidirektor

Hans Junkermann as Exzellenz Vangon

Edwin Jürgensen as Staatsanwalt

Aribert Grimmer as 2. Kriminalbeamter

Theodor Thony as 3. Kriminalbeamte

Erich Dunskus as Chef der Kriminalpolizei

Angelo Ferrari as Gangster Fred im Expresszug

Lothar Geist as Erwin Wutzke

Clemens Hasse as Ganove Peter

Paul Schwed as Der lange Poll

Willi Schur as Bahnbeamter bei der Gerichtsversammlung

Erich Walter as Hoteldirektor

Heinz Wemper as Verwalter des Lombard-Hauses

Walter Werner as Dr. Balderin

Charly Berger as Beisitzender Richter

Katharina Berger as Blumenmädchen im Hotel

Hans Bergmann as Taxator

Max Harry Ernst as 1. Gerichtsreporter

Horst Birr as 2. Schlafwagenschaffner

Ernst Behmer as 1. Schlafwagenschaffner

Fritz Draeger as 2. Gerichtsreporter

Fred Goebel as Hotel-Empfangschef

Gerhard Dammann as 3. Schlafwagenschaffner

Karl Jüstel as 1. Polizeioffizier

Kurt Kramer as 2. Polizeioffizier

Erich Nadler as 3. Polizeioffizier

Friedrich Ohse as Polizeileutnant

Boris Alekin as Hotelkellner

Otto Krieg Helbig as Fotoreporter

Fredy Walden as 1. Zuschauer bei der Gerichtsverhandlung

Albert Karchow as 2. Zuschauer bei der Gerichtsverhandlung

Walter Steinweg as Zivilbeamter im Polizeipräsidium

Herbert Gaidzik as

Hellmuth Passarge as

Arthur Orlop as

Theodor Popp as

Alfred Schwarz as

Fred Tasso as

Georg Henry Tschersich as

Friedrich Weigelt as

Hans Weidner as

Kurt Alexander Duma as