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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Cast
Karel Fiala
Professor Oskar Grant
Anny Ondra
Anny Grant
Karel Lamač
Ing. Milan Bell
Jindřich Lhoták
Dr. Karel Selín
Emil Artur Longen
Durk, the Magician
Jan S. Kolár
Ferdinand Kardan
Přemysl Pražský
Martin Bálek
Antonín Marek
Baron Evans Margus / Servant
Josef Šváb-Malostranský
Jan
Alfred Baštýř
President of Police
Václav Pražský
Reporter
Vojtěch Záhořík
Grant's Assistant
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