Mr. Mirakel is the last novel written by E. Phillips Oppenheim in 1943. Marquis Roderigo de Cordovina is leaving his Portuguese estates in Lisbon because he is being pressured to join the German military and command a mechanical battalion. He meets Miss Anne Strangeways in the seaplane terminal. The two board an airboat for London. Shortly thereafter, they meet again at the home of Princess Rosina Di Gomez who is the niece of the Portuguese Ambassador. At this point the plot changes to encompass the arrival of Mr. Mirakel, a mysterious, wealthy, well-connected personage who insinuates himself in the company. Thereafter, the book becomes a strange fantasy about a remote land of tropical perfection where war, and rumors of war, are unknown!