Lieutenant Ville Somero investigates a sabotage at a fortress site on the Karelian Isthmus in the summer of 1939. His suspicions are directed at the guests of a nearby guesthouse. Aarno Teräs an engineer leading the fortification site, and his bride Birgit Lahti get into trouble because of a band of spies and dancer Veronica Sorrento.
Director of Photography: Eino Kari
Producer: Theodor Luts
Director: Theodor Luts, Erkki Uotila
Writer: Eero Pursi, Aksella Luts