His identical twin brother, James Taylor, is a successful detective chief inspector in the Cambridge police force.

James has gone missing, and his wife Lucy (Anna Maxwell Martin) enlists John's help to solve the mystery.

Pretending to be his brother, John infiltrates the local police station to investigate, and becomes inadvertently embroiled in solving other cases.

John is tasked with infiltrating the major investigations team, gathering information and solving a completely unconnected murder of a solicitor, Alan Howells, all whilst remaining in character as his brother.

Holly, the police technology specialist, is found dead in her flat and Lucy is arrested at the scene on suspicion of her murder.

[citation needed] Executive producers include Kenton Allen, Chris Sussman and Kathryn O'Connor.

[5] In January 2024 Anna Maxwell Martin joined the cast, as well as Izuka Hoyle, Gerran Howell, Dipo Ola, Dorothy Atkinson and Dylan Hughes.

[6] Guest appearances in the series include Karl Pilkington, Felicity Kendal, Hammed Animashaun, Paul Chahidi, Derek Jacobi, Allan Mustafa, Sam Swainsbury and Rose Ayling-Ellis.

In a five-star review for The Telegraph, Anita Singh described the "cosy cryptic crime series" as a "comedy triumph".

[14] In a three-star review for The Guardian, Lucy Mangan said it was "like watching Peep Show's Mark join the police force".

[15] In a three-star review for The Independent, Louis Chilton said, "If you like Thursday Murder Club, you'll love this abject pap".