At the Coopers Chase retirement village, psychiatrist Ibrahim Arif, former trade union leader Ron Ritchie, and mysterious Elizabeth Best are members of the Thursday Murder Club (TMC), which meets weekly to discuss cold cases. They are soon joined by Joyce, a retired nurse and new resident, whose medical knowledge proves useful. The group currently is investigating a case once handled by Detective Inspector Penny Gray in 1973, who was a member of the club and now comatose in Cooper Chase’s hospice, involving the unsolved murder of Angela Hughes. Police Constable Donna De Freitas, recently transferred from London, visits the village…