Doors of the Night - Frank L. Packard

New York City, 1922—Murder—half-million dollar robbery—false accusation—secret passage—the underworld—a mystery woman—a masked man—a crooked lawyer—stolen jewels—a forged will. . . “Every hour . . . held a surer promise, not only of desperate peril to himself, but a promise that he would find himself launched in a sea of crime, of shuddering things, of murder, of blood, of sordid viciousness, of hate.” - Summary by Delmar H. Dolbier