"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...