Clausen has had a special visitor in his store. He has been hypnotised and now believes he is a monkey. Tue in the meantime, is trying an experiment on the residents of the house involving hash.

Larsen inherits the personal belongings of an associate from the old days by the name of Ludwig. Among the few items is a letter, asking Larsen to settle the score with the fence who cheated Ludwig out of the money from the theft of a valuable bracelet.