A tough gang of ex American GIs are responsible for robbing ammunition shipments in Tokyo, ruthlessly killing their own rather than leave them behind injured. When one gang member dies in such a manner, the authorities make the link with the killing of a US guard and send ex army officer Eddie Kenner (Robert Stack) in undercover to meet gang leader Sandy Dawson (Robert Ryan). Kenner uses a falsified criminal record to fool Dawson thus infiltrating the gang in order to bring about their downfall.

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