The inventor Sir Claude Amery wants to give the thief of the formula for his latest invention the chance to return it in the dark without being recognized. He gathers everyone in the house in the library and has the lights switched off for a short time. When the light comes back on, Amery is dead. A case for the Belgian master detective Hercule Poirot.
Claus Peter Witt
Director

Horst Bollmann
Hercule Poirot
Heinz Fabian
Dr. Graham

Ernst Fritz Fürbringer
Lord Amery

Käthe Haack
Caroline

Gert Haucke
Inspec. Japp
Otto Kurth
Butler

Anita Lochner
Barbara

Ulli Philipp
Lucia
Jochen Schmidt
Richard
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