What Happened at Hazelwood is a 1946 detective novel by the British writer Michael Innes.

[1] It is a standalone novel from the author who was best known for his series featuring the Golden Age detective John Appleby.

Ralph Partridge writing in the New Statesman observed "Michael Innes may be a Professor of English in disguise but What Happened at Hazelwood would never win him a Chair of Detection.

Sir George Simney, baronet and owner of Hazelwood Hall, is found dead in his library during the middle of a snowstorm.

Much of the story is narrated by Simney's wife, a former actress who despised him but insists she didn't murder him.