According to his will, his heirs must wait until the youngest among them (a simpleton named Janot) reaches the age of 21 before the estate can be settled.

Then Rosalie and her husband meet untimely deaths, which calls the affair to the attention of a police inspector.

[1] Before the film's initial release, the Italian rating board rejected it in January 1968 due to scenes of Femi Benussi nude.

[1] The film was later re-released as L'assassino ha le mani pulite lit.

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