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| Sir Henry Merrivale | |
|---|---|
| First appearance | The Plague Court Murders (1934) |
| Last appearance | The Cavalier's Cup |
| Created by | Carter Dickson |
| In-universe information | |
| Nicknames | The Old Man, H. M., The Maestro |
| Gender | Male |
| Occupation | Detective |
| Family | Kitty Bennett (sister) |
| Spouse | Lady Merrivale |
| Children | Two daughters |
| Relatives | James Bennett (nephew) |
| Nationality | British |
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." (a pun on "His Majesty"), or "the Maestro", Merrivale appears in 22 of Carr's locked-room mysteries and "impossible crime" novels of the 1930s, 1940s, and 1950s,[1] as well as in two short stories.