A man is accused of a series of murders that were actually committed by a crazed killer called "The Tiger." He must prove his innocence and catch the murderer.

The film begins in a BBC studio with the 100th edition of "In Town Tonight". Flotsam and Jetsom open with a "topical number". Then there is an interview with a distinguished actor, which dissolves into a performance of one of his famous melodramas about a wicked moneylender etc.

In 1880, the criminal called The Wolf is responsible for a murderous rampage in France. When the Brisson Bank is robbed in Paris and the employee Michelle is murdered, the wealthy Chevalier Lucio del Gardo is the only chance to save the bank. Chevalier proposes to the owner M. de Brisson to deposit a large amount of gold, but in return he would like to marry his daughter Cecile. However, Cecile is in love with the efficient clerk Lucien Cortier that belongs to the lower classes and refuses the engagement. In order to get rid off the rival, Chevalier uses evidences to incriminate Lucien, manipulating the incompetent Parisian chief of police.

An evil prison administrator cruelly abuses the inmates at his prison, until one day the tables are turned.