The film, set in 1912, is about the exploits of France's first motorized police brigade.

In 1907, following a violent crime wave, French President Georges Clémenceau decides to create the first motorized police brigade, soon nicknamed the Tiger's brigades. One of the first missions assigned to chief inspector Paul Valentin and his daring men, inspectors Terrasson, Pujol, and trainee inspector Achille Bianchi, is to neutralize Jules Bonnot and his ruthless gang of anarchists.—Guy Bellinger