Tanja Bulkova arrives in Finland under the name Toini Salonen and, with the help of spy chief Rosenberg, becomes the secretary of engineer Rautavuori and discovers the drawings of a secret invention.

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Main Cast: Ensio Jouko, Eija Karipää, Erkki Uotila, Joel Asikainen, Arvi Tuomi, Matti Lehtelä, Urho Westman, Erkki Salin, Esko Mannermaa, Helen Mardi

Directors: Erkki Uotila, Theodor Luts

Writers: Eero Pursi, Aksella Luts, Theodor Luts

Editor: Eino Kari

Cinematographer: Eino Kari

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