A fisherman catches a sea diver who resembles him, and the diver reveals he's a mobster who cheated his associates out of diamonds. The mobsters mistakenly think the fisherman is the double-crosser they're supposed to kill, and he must find a way to clear his name with the help of a girl he's interested in.

The Big Mouth
A fisherman's unexpected catch sets off a thrilling adventure as he becomes the keeper of a map leading to a treasure trove of stolen diamonds, pursued by a variety of ruthless criminal organizations.