The Zeppelin's Passenger is a fictional suspense story by E. Phillips Oppenheim. A Zeppelin crashes in a small English town and at first, no one realizes it was carrying a mysterious passenger. A tense melodrama about espionage and romance during World war I. The plot revolves around the residents of Dreymarsh finding an observation car from a German zeppelin and a Homburg hat nearby. When Mr. Hamar Lessingham, an Englishman, shows up at Sir Henry Cranston's home, Mainsail Haul, the mystery becomes even more difficult. Hand-carried letters from Major Richard Halstead and a British POW in Germany are carried by Lessingham. He gives them to Helen, Halstead's fiancee, and Phillipa Halstead, who haven't heard anything about Richard's whereabouts and are very worried. Sir Henry's wife Phillipa falls head over heels for Lessingham after thinking Sir Henry is a coward for not joining the war effort. Will Phillipa and Helen Halstead's letters have a cost? Will everything get revealed? To know the conclusion readers should read the book!