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A young inventor is kidnapped to force him to tell the secret of his invention, but he foils his captors thanks to a pen with invisible ink.
Top Cast
Renée Carl as Juliette Michaud
René Navarre as Le détective Julien Kieffer
Paul Manson as Emile Darbois
Jean Devalde as Jean Brémond
Fernand Herrmann as An Accomplice
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