Mickey Gordon, whose sense of hearing has been dramatically bolstered by Dr. Brett's extract, seeks to steal a diamond for the 6th Sense owned by young Alce Howard. But this heightened sense of hearing is overcome by the beautiful music Alice plays on her piano and Gordon attempts to turn against his evil boss.; The Shining Knight must prevent the famed "Yellow Topaz" from falling into the hands of Fingers, and also save its owner, a man who fancies himself another Don Quixote.; The Kid and Stripesy must stop Bloodhound, the man with a super sense of smell, from locating the amazing sea-green emerald for the Sixth Sense.; Henchman is used by the Sixth Sense, first to bribe Karl Denner's cook to lace his food with poison, then to steal his valuable blue-white diamond.; Eagle Eye joins a caravan of some of the strangest people ever seen "under the big top" in order to steal the famed Garnet Diamond.; Five criminals, kidnapped by a robot, have their senses heightened by a certain extract created by a Dr. Brett, in order to be used by a paralyzed man known as the 6th Sense, who plans to use them to steal five jewels.; Having obtained all the gems he needs, the Sixth Sense first electrocutes each of his cohorts, then reveals that this personna is actually a wax dummy and that the real villain, the Robot, is actually Dr. Brett in disguise.