The novel begins in Paris on the wedding night of Sally and Rex Garrett. A former member of the French Foreign Legion Rex mysteriously disappears on the night of his wedding. At The Pigeon House, a lonely inn, a band of conspirators await the arrival of a deserter from the Foreign Legion, who is their key man in their plan to start an uprising in French Morocco. The conspirators have also driven the bridegrooms closest friend into exile and a shameful death, which means he must hunt them down and destroy them. Williams spy story, The Pigeon Man (1927), presents us with a character whose motivations are as obscure as any in modernist literature. Why is the hero doing what he is doing? Why, for that matter, are the other characters? George Valentine Williams never says explicitly, leaving readers to puzzle this out for themselves.