During World War I, the engineer Torben returns home with secret papers from the Russian Tsar to the courier Tuschin, Torben's best friend. Tuschin is found murdered, however, and to solve the murder, Torben stays at his hotel. Here he meets several mysterious people, not least the breathtaking stenographer Inge. But in the hotel, no one is who they pretend to be.—danskfilmskat.dk