The novel is about 43-year-old Dr. Ernst Sebastian, a lawyer who works as an "Untersuchungsrichter" (investigating judge) in the fictional town of Sankt Nikolaus during 1927. One Saturday afternoon a middle-aged man called Franz Adler, who has been arrested for the murder of a prostitute, is brought before him. During the interview—a preliminary hearing during which the two men are alone in Sebastian's office—Sebastian recognizes Adler as his old classmate, who attended the secondary school in Sankt Nikolaus, which was then in Austria-Hungary, for two years when they were both 16 and 17. Adler, however, who appears to him fearful and beaten by life, does not seem to recognize the judge, and Sebastian decides to postpone any private talk with Adler till the following Monday.