
Professor Grant signs a contract with Dr. Selin for the sale of his invention of cold light with the plans for his invention being kept in Grant's apartment. The negotiations are secretly heard by the illusionist Durk, who wants to seize the invention. A few days later Selín is found dead, killed by a light bulb filled with poisonous gas. Durk performs at the birthday party of Grant's daughter Anna and seizes the plans for the invention.
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Professor Oskar Grant

Anny Grant

Ing. Milan Bell

Dr. Karel Selín

Durk, the Magician

Ferdinand Kardan

Martin Bálek
Baron Evans Margus / Servant

Jan
President of Police
Reporter
Grant's Assistant
Jan S. Kolár
Jan S. Kolár, Karel Lamač, Karel Lamač
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