Dorothy Preece Simpson (20 June 1933, Blaenavon, Monmouthshire (now in Wales) – 20 August 2020 (aged 87)) was an English-language writer of mystery novels, and a winner of a Silver Dagger Award from the Crime Writers' Association of Great Britain.

[1] Simpson was brought up in South Wales, went to Bridgend Grammar School and then to Bristol University, where she read modern languages.

After university she moved to Kent (the background of the Thanet novels) to teach French at Dartford and Erith grammar schools from 1955 to 1962.

She was determined to "devote her next efforts to creating an intriguing murder mystery staged around an engaging sleuth," and came up with her mainstay characters Inspector Luke Thanet and his colleague Sergeant Michael Lineham in The Night She Died, the first of a series of 15 novels.

[1] Severe repetitive stress injury forced her to stop writing in 2000.