A young prostitute, Gullan Svan, is murdered one night. The police suspects that the murderer is a student, since she had a lot of students as customers. The murderer stole a picture of Gullan after he killed her, a picture which later is found in a rented tuxedo when the tuxedo is returned. Four students decide to solve the case, but it seems that the truth is even closer than they first suspected...
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Character: Bo Hagberg
Character: Torsten Hertgren
Character: Robert Croona
Character: Gustaf Eriksson
Character: Kalle Larsson
Character: Berit Lange
Character: The Soap Girl
Character: Maud
Character: Heliga Birgitta
Character: Pettersson
Character: Gullan Svan
Character: Criminal Detective
Character: Nilheim
Character: Professor of Anatomy
Character: Österholm
Character: Customer in Barber Shop
Character: Antique Dealer Bladh
Character: Criminal Assistant (uncredited)
Character: Dr. Berg (uncredited)
Character: Singing Servant at Flustret (uncredited)
Character: Sister Vendela (uncredited)
Character: Teacher (uncredited)
Character: Kalle's Date (uncredited)
Character: Cathedral Janitor (uncredited)