Sir Adam Disappeared is a mystery novel by E. Phillips Oppenheim, a master of suspense and intrigue. The story follows the sudden disappearance of Sir Adam, a wealthy and influential man, whose vanishing leaves a trail of questions and suspicion. As the mystery unfolds, the investigation delves into the dark secrets of those around him, revealing hidden motives, danger, and unexpected twists. With Oppenheim's signature style, the novel weaves together suspense, romance, and deception, making it a compelling read for fans of classic mysteries.