March and Jules are teenage twins, following in their father's footsteps as jewel thieves, but when their latest job goes wrong they end up with one jewel, a sapphire called the Morning Star, one of three cursed jewels--and the only way they can break the curse is to elude the FBI, Interpol, and a gang of international criminals, find the other two jewels, and reunite them.

Two thieves, caught stealing from an Egyptian market, are brought before the Cat Pharaoh, who agrees to pardon them if they bring back a treasure that was stolen from her, without taking anything else and without getting the precious Jewel Fish wet.

Frank and Joe Hardy must retrieve a top-secret invention that a scientist had hidden in his study. Their investigations put them on the trail of jewel thieves and smugglers.