Opposite Regensen lives the brave and well-off coppersmith Smidt with his equally brave wife and their delightful young daughter Rikke, as well as the three journeymen Madsen, Mikkel and Lars, who, according to old craftsman custom, both eat and stay with the master. When an acquaintance of journeyman Madsen comes to visit, he learns that he is unhappily in love with Rikke, and he promises to help him get in touch with her.

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.