Behind That Mask, by Harry Stephen Keeler [Novel] (epub/Kindle/pdf)
This classic 1938 mystery could only have come from the fevered imagination of Harry Stephen Keeler! Behind That Mask is a direct sequel to his 1932 novel, Finger! Finger!—and although it concludes successfully the story begun in volume one, readers should definitely have finished Finger! Finger! (available for sale, if you didn't get it during its free period here) before starting this one. You have been warned!