The Man Who Died Twice (Thursday Murder Club 02) by Richard Osman

It's such nice to be back with the four elderly residents of Coopers Chase Retirement Village who make up the Thursday Murder Club. They might be septuagenarians but together their skills make them a force to be reckoned with. Ex MI5 spy Elizabeth, still sharp as a tack with a bank vault of a memory, ex nurse Joyce, who is a lot smarter than she seems with her friendly demeanour, never-ending chatter and badly knitted friendship bracelets, ex union boss Ron, street smart with a lot of useful contacts and psychiatrist Ibrahim, brilliant with a photographic memory but reserved and fragile.
Originally established to investigate unsolved cases, the Murder Club previously found themselves investigating a real murder carried out on their turf, along with young PC Donna de Freitas and her boss DCI Chris Hudson. Now the excitement at solving that murder has died down they're back to investigating unsolved cases in the Jigsaw Room. That is until Elizabeth receives a letter from someone she knows died a long time ago, and suddenly the Thursday Murder Club finds itself back in action dealing with MI5 agents, twenty million pounds worth of missing diamonds, dead bodies, a violent money launderer and a powerful local drug baroness. Donna and Chris are soon back on the scene, staking out the drug baroness as well as giving the group some help in their quest to find the diamonds. It was also good to see Bogdan, the very resourceful Polish builder back in the thick of the action.