A gang terrorize Mexico City's high society in 1915. Murder, kidnapping and robbery are their trademarks. One police inspector (Cabrera) follows the gang's crimes and eventually sends them to jail.

The plot of the Gang in the Grey Automobile is more than just a cops and robbers shootout. It is based on the actual exploits and legends of a real gang that terrorized Mexico City until they were finally tracked down by the police. But the most amazing part of the film is at the end where thousands of people in their Sunday best, top hats, parasols, hoop skirts, etc. are seen gathering across from a long wall that is obviously part of a prison. The whole mood is that of a festive Sunday event, that has attracted the most proper elements of society. Then the gang members are brought out and tied to posts just in front of the wall.—David Anthony Richelieu