The Adventures of Jimmie Dale

The protagonist, Jimmie Dale, leads a double life as a wealthy playboy by day and a masked vigilante known as The Gray Seal by night. Utilizing his skills as a civil engineer, he embarks on daring heists, leaving behind a distinctive gray paper seal as his calling card. The narrative takes a turn when he is caught by a woman who blackmails him into confronting powerful crime organizations. Frank L Packard's mystery novels cleverly blend adventure and moral dilemmas, showcasing the complexities of a man living in two worlds.