Leslie Charteris was the creator of Simon Templar, the Saint, one of the most enduring figures in twentieth-century mystery and thriller fiction. Born Leslie Charles Bowyer-Yin in 1907, Charteris began publishing young and found lasting fame with the Saint stories, which combined crime fiction, adventure, wit, romance, and a stylish antiheroic code of justice. The Saint books became an international phenomenon across novels, short stories, radio, film, and television, helping define a particular strain of gentleman-adventurer mystery fiction that appealed to readers of British thrillers, pulp adventure, detective stories, and espionage fiction. The Saint Closes the Case belongs to the early formative period of the series, when Charteris was still sharpening the mixture of danger, charm, and moral bravado that made Simon Templar a lasting popular-fiction icon.