"Doors of the Night" is a novel written by Frank L. Packard, first published in 1922. The book is a thrilling mystery story that follows the adventures of Jimmie Dale, a wealthy playboy who secretly leads a double life as a notorious criminal known as "The Grey Seal." The story begins when Jimmie Dale receives a letter from a mysterious woman, which leads him on a dangerous quest to recover stolen jewels and clear his name. Along the way, he faces numerous challenges and obstacles, including rival gangs, corrupt officials, and a web of intrigue and deception. As the story unfolds, Jimmie Dale must use all his wit and cunning to outsmart his opponents and solve the mystery of the stolen jewels. Along the way, he must confront his own past and grapple with his conflicting loyalties to his criminal alter ego and his desire to do the right thing. Moreover, "Doors of the Night" is a gripping mystery novel that keeps the reader on the edge of their seat until the very end. It is a must-read for fans of the genre and anyone who loves a good adventure story.