Sir Henry Merrivale is a fictional amateur detective created by "Carter Dickson", a pen name of John Dickson Carr (1906–1977). Also known as "the Old Man," by his initials "H. M.", or "the Maestro", Merrivale appears in 22 of Carr's locked-room mysteries and "impossible crime" novels of the 1930s, 1940s, and 1950s, as well as in two short stories.
- Citizenship
- United Kingdom
