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Willy Kritz, night watchman in a renowned Berlin hospital, smuggles valuable exhibits out of the clinic's pathological museum at night. On absurd criminal paths he encounters Lilo Berger, who, as head of a credit department, has to hide the fact that, thanks to an invented Dr. Tetzlaff, she is cheerfully running a credit scam. Now, however, Berger's superiors demand to see the ominous doctor, so that only one way out seems possible: Willy Kritz – who gets all his surgical knowledge from the TV series "The Black Forest Clinic" -  must bring the phantom to life and as it turns out plays Dr. Tetzlaff with astonishing success.