Customs agent Dean Jagger (Cliff Holden) goes on the trail of a necklace and a killer. He is the C-Man.
The film moves along at a quick pace and if you just go with it, it carries you along. Unfortunately, it is a little confusing at times and because the picture quality has deteriorated, some dramatically filmed sequences are confusing instead of effective. John Carradine (Doc Spencer) plays a drunkard - it's his look that carries it off for him, not particularly his acting, although he probably wasn't acting! The soundtrack alternates between the over-dramatic and the jazzy art-house cool that suggests experimental film.
There are some very fake punch-ups that run alongside disturbing violent incidents. Make sure that your bed-knobs don't unscrew! The night club scene is also slightly embarrassing - terrible song, unrealistic audience and some poor acting.
Overall, the film is watchable - it should be better, though. Maybe a re-make?