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.
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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.
Renée Carl ,René Navarre ,Jean Devalde
Louis Feuillade
Gaumont ,
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as Juliette Michaud
as Le détective Julien Kieffer
as Jean Brémond
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