Death in a White Tie (1938) by Ngaio Marsh is the seventh novel in her Inspector Roderick Alleyn series. Set during London’s debutante season, the story begins with a body found in the back of a taxi. Alleyn investigates a blackmailer targeting society women, but the case turns tragic when his trusted friend Lord Robert Gospell is murdered. The novel is considered one of Marsh’s finest works from the 1930s, combining elegant social settings with a tightly constructed mystery.