A legendary blue diamond draws five friends on an arduous expedition to the jungles of Thailand. Things go wrong after a murder, with one friend going to prison. The friends are reunited after seven years when one is kidnapped.

Miles Logan is a jewel thief who just hit the big time by stealing a huge diamond. However, after two years in jail, he comes to find out that he hid the diamond in a police building that was being built at the time of the robbery. In an attempt to regain his diamond, he poses as an LAPD detective.

An adventurer and his buddies race a former Nazi and others to diamonds in the South American jungle.

A French jeweler travels to India in search of a fabulous diamond.

In order to win back his girlfriend, Mike Shayne promises to give up his detective practice and get a job as riveter in an aircraft plant. He quickly finds himself investigating the theft of industrial diamonds from the plant's safe and, utilizing a variety of false identities, traces them first to a dress factory and later to a Hawaii-bound ocean liner. Escaping several attempts on his life, he is able to uncover a Nazi smuggling ring, but the location of the missing diamonds continues to elude him.

Mysterious, hookah-smoking Doctor Nicholson will stop at nothing to get his hands on the valuable “blue diamond.” A rich man’s daughter, a poor French count, a marriage of convenience, bomb threats and explosions, kidnapping and cocaine are just a few of the ingredients in Nicholson’s dogged struggle to obtain the precious diamond. (stumfilm.dk)