An unknown guest checks into an obscure hotel. He is a burly but well-dressed gentleman carrying an umbrella and a tree frog in a glass. This man spends most of his time wandering the hallways and staircases of the inn, ostensibly to hunt for flies to feed his pet. But quite obviously, there is more to it than that: the man also listens at doors and peeks through their keyholes.
Heinrich George
Der Mann mit dem Laubfrosch
Hans Junkermann
Kunsthändler Bruneaux
Evelyn Holt
Yvette Bruneaux seine Tochter
Walter Rilla
Henri Vallencours
Olga Limburg
Lou
Harry Nestor
René
Alexander Murski
Henris Vater
Julia Serda
Henris Mutter
Hugo Werner-Kahle
Polizei Präfekt
Rudolf Biebrach
Kommissar
Karl Hannemann
Hausdiener
Maria Forescu
Zimmermädchen