Shadow Double Novel Volume 101 Gangdoms Doom & Golden Grotto

"The Master of Darkness crushes crime in two early pulp novels by Walter B. Gibson. First, after one of his key agents is murdered by mobsters, The Shadow journeys to Chicago to avenge the death through 'Gangdom's Doom.' Then, piracy on the high seas lures the Dark Avenger into a deadly confrontation with the murderous mastermind of 'The Golden Grotto.'"