Mitchum is Eddie Coyle, a three-time loser. One more offense and he goes to prison for life--no parole, no hope. Police learn of an impending Boston bank robbery and go to Coyle, telling him that they know he earns a living for his destitute family by running illegal goods across state
lines. They will put him away unless he squeals on the robbery gang. He reluctantly agrees to help and, after selling the gang some guns, contacts detectives, who tell him his information is insufficient. He must go on being a permanent informer and is ordered to help capture gang boss Scalise
(Rocco). Before Eddie can move, however, Scalise is arrested. Coyle's underworld friends po...