Mario consigns his girlfriend Licia to a whorehouse for an evening in order to get the photographic goods to blackmail her father with. To get her out of the way, Licia is then consigned to a mental hospital by her father.

A renowned author, college professor and criminologist is given a year off in order to write his latest book. His arrival in Buenos Aires gives him the opportunity to work on his true project, planning and pulling off the perfect crime.