A former teacher, Thomson was educated at Chelmsford High School. She is the creator of the Chief Inspector Jack Finch (Inspector Rudd in American editions) and Sergeant Tom Boyce series of novels. Since 1990 she also wrote a series of six Sherlock Holmes pastiche anthologies of short stories. Her works have been translated into many languages. June Thomson currently lives in St. Albans in Hertfordshire and is the mother of the philosophy writer Garrett Thomson. Her other son is Paul Thomson.