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Eddie Constantine is the principal reason to see Ca Va Barder. Once more, Constantine plays a fellow of dubious ethics who nonetheless does the right thing when necessary. This time, he's trying to find out who's been stealing shipments from a gunrunner pal. Posing as his friend, Constantine plunges into the demimonde of European organized crime. He also runs across an ex-lover, now married to a menacing professional knife-thrower. Even without the obligatory chase and fight scenes, Ca Va Barder keeps jumping from first frame to last.