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Olaf Schlüter has 'dropped out' of his electrical apprenticeship. His teacher Kurt Glanz - previously a quiet and respectable family man - lost his balance after the accidental death of his young daughter and has increasingly become a ruthless thug due to alcohol abuse. Together, Olaf and Kurt slip into the milieu of tramps. One morning, Olaf is found beaten to death in the unfinished building in which he and his drinking buddies were staying. Kurt Glanz is arrested by the police in his apartment on suspicion of murder. His wife Hedda turns to Dr. Franck. The incriminating witness statements of the 'bum brothers' contain contradictions. Shortly after he has completely given up alcohol, Matula has to immerse himself in the 'milieu' and put on the clothes of a bum at Dr. Franck's request. Dr. Franck looks into Olaf and Kurt's middle-class environment. No sooner have they released Kurt from custody than another murder occurs.