Following up the strange sighting of men who appear only as shadows, Doctor Fate must track down Karkull, who has invented the machine making this possible, turning him into a shadow for all eternity.; A strange horticulturist creates devilish plant-killers that he sells to wealthy clients, then threatens to kill them unless they pay him blackmail.; Carson appears to battle Seminoles in the Everglades but actually it's white men trying to hide a pitchblend mine.; A spoiled rich girl hires "fake" crooks to liven up a party, and ends up being kidnapped.; Lance returns to Sumatra.; Crooks try to steal the biggest gold nugget ever found in the territory.