Johan is a two-fisted Gothenburg cop who gets caught up in a shootout with jewel robbers. After the smoke clears, one robber, shot by his accomplice, and an innocent bystander are dead. Three witnesses, including Helen, identify the deceased crook's trigger-happy colleague as thug extraordinaire Leo Gaut. Gaut soon threatens the three witnesses, and only Johan, the badge-wearing hero, can save them.