Ngaio Marsh was a New Zealand author and playwright who wrote over 30 detective novels. She is best known for her Inspector Alleyn series, which featured the eponymous detective. FEN is a novel by Marsh set in the fictional English village of Fenchurch St. Paul. Mae is a novel by Marsh set in the fictional English village of Thrush Green. SEDGE is a novel by Marsh set in the fictional English village of Lulling.