A series of murders are planned to gain control of an inheritance.; The Star Diamond is on exhibit at Bufany's, a temptation for many thieves, including the Cat, a man with a claw instead of a hand.; An insane gangster called the Octopus has an undersea hideout where the Blue Beetle and Joan almost die, until Mike rescues them.; Judith Carthy's life is in danger because she has papers that proved Felland is head of an organization that stole army secrets.; All who oppose the Chess Master die.; Davy wishes for a pile of money and the Grogans conjur up the devil to help get it away from him.