Train driver Leo Mangold has been living alone in his two-room apartment for years. His colleague Adrian Hauser is married and having an affair with Thai go-go dancer Apia. To ensure that she does not lose her residence permit, Adrian asks his friend Leo to marry Apia, and Leo agrees. To deceive the immigration authorities, Apia has to move in with Leo, much to his displeasure. They begin to fall in love with each other. Adrian is not happy about this. Nightclub owner Willi also puts pressure on the couple because he wants to place Apia in a massage parlor.