To get evidence against a crooked garage owner, a rookie cop masquerades as a hard case who wants a job as a mechanic.

Follow the evolution of a small time juvenile delinquent hood to a big time racketeer. Based on the famous 1950 Brinks Robbery in Boston that netted the crooks $2.5 million. The story delves into the psychology of the perpetrators, as well as the intricate mechanics of the hold-up.