Hannay had previously appeared in The Thirty Nine Steps (1915), his most famous adventure in which he battles German spies across England and Scotland, and two books about his activities during the First World War, Greenmantle (1916) and Mr Standfast (1919).
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It is some time after the war, and Sir Richard Hannay is living in rural tranquility, having bought Fosse Manor and married Mary Lamington (both featured in Mr Standfast); they have a small son, named Peter John.