The scene of the story taking place in the 18th century is an inn, which is advertised by its owners for sale. The inn was namely the scene for mysterious disappearances and murders, but the result of all these events, the treasury is hidden and guarded by the mother. Everybody want to get it from her during one night: the inn-keeper couple, the fake couple who arrived as buyers, Colonel Majorossy with his son, the secret agent and the servants.

Péter tries to make a film on "Swan-Lake". At the weekend, shooting stops and the staff goes home. Péter leaves for home with his wife, Judit, but as he catches sight of a girl at the station, he cannot resist the temptation and gets off the train.