Two old friends Hermann Krüger and and Armin Horn have a meeting on the roof of a building. Hermann Krüger, a great businessman and investor, wants back the money that he has lent to Armin, a liquor producer. There is a quarrel between the two men. Some minutes the police arrives because Hermann Krüger has fallen from the building. Heidi Krüger, who was waiting for her husband, in their car says to the police that she hasn't seen anybody entering in the building. On the roof the police finds a logo of the Horn liquor factory. In the house of the Krüger family the son of Hermann receives the commissioner and Ina speak with an employee of the company Ulrich Püchler who will be fired by his boss. The autopsy shows that Hermann has defended himself, under his nails there was fiber of leather.