Herwart Ehmken, who lived alone in an apartment, has been killed by a shot: the shot was coming from an apartment of the building across the street.Werner Riedmann says that they have found many finger prints of a child and a piece of paper with the letters "s" and "v" . Gert Heymann meets Mrs. Hausmann, the neighbor of Herwaer because she listened always the same music in Herwaer's apartment and so she called the police.She says that Herwart was a very solitary man, but in last weeks a young boy was visiting Herwart , but she doesn't know the name of the boy.Henry Johnson goes to the building across the street and there she meets Sigbert Laufen, a comedian, who is quite surprised when Henry shows him the apartment of Herwart,Sigbert has helped Horst Ehmken to find an apartment for his brother Herwart.Besides Sigbert had to travel to Hamburg , his manager sent him a telegram, finally it's a false invitation.
—zutterjp48