In a peaceful retirement village, four unlikely friends meet up once a week to investigate unsolved murders. But when a brutal killing takes place on their very doorstep, the Thursday Murder Club find themselves in the middle of their first live case. Elizabeth, Joyce, Ibrahim and Ron might be pushing eighty but they still have a few tricks up their sleeves. Can our unorthodox but brilliant gang catch the killer before it's too late?

It's the following Thursday. Elizabeth has received a letter from an old colleague, a man with whom she has a long history. He's made a big mistake, and he needs her help. His story involves stolen diamonds, a violent mobster, and a very real threat to his life. As bodies start piling up, Elizabeth enlists Joyce, Ibrahim and Ron in the hunt for a ruthless murderer. And if they find the diamonds too? Well, wouldn't that be a bonus? But this time they are up against an enemy who wouldn't bat an eyelid at knocking off four septuagenarians. Can The Thursday Murder Club find the killer (and the diamonds) before the killer finds them?

One Thursday afternoon in the seniors' center, a decade-old cold case—their favorite kind—leads the Thursday Murder Club to a local news legend and a murder with no body and no answers. A new foe they call "Viking", wants Elizabeth to kill former KGB chief Viktor, or he will kill her sweet best friend Joyce. Activist marked for death Ron and psychiatrist Ibrahim chase clues for Viking's identity, and investigate mob-queen prisoner from last book. This third adventure ranges from a prison cell with espresso machine to a luxury penthouse with swimming pool high in the sky.

Shocking news reaches the Thursday Murder Club. An old friend in the antiques business has been killed, and a dangerous package he was protecting has gone missing. As the gang springs into action they encounter art forgers, online fraudsters and drug dealers, as well as heartache close to home. With the body count rising, the package still missing and trouble firmly on their tail, has their luck finally run out? And who will be the last devil to die?

Who's got time to think about murder when there's a wedding to plan? It’s been a quiet year for the Thursday Murder Club. Joyce is busy with table plans and first dances. Elizabeth is grieving. Ron is dealing with family troubles, and Ibrahim is still providing therapy to his favourite criminal. But when Elizabeth meets a wedding guest who’s in trouble, kidnap and death are hot on their heels once more. A villain wants access to an uncrackable code, and will stop at nothing to get it. Plunged back into action once more, can the gang solve the puzzle and a murder in time?