Ngaio Marsh is a renowned mystery novelist best known for her creation of the character Inspector Roderick Alleyn. When it comes to synonyms for the name Ngaio Marsh, one can use phrases like mystery writer, detective novelist, or crime fiction author. These synonyms are apt for describing her prolific career, which spanned over 50 years, during which she authored 32 novels and several plays. Marsh's books are known for their vivid and realistic descriptions of the social and cultural milieu of New Zealand and the UK. She is credited with introducing the concept of the "whodunit" mystery to the world of literature, making her a seminal figure in the genre of mystery fiction.