"In a peaceful retirement village, four unlikely friends meet weekly in the Jigsaw Room to discuss unsolved crimes; together they call themselves The Thursday Murder Club. There's Red Ron, the infamous former socialist firebrand, still causing trouble; gentle Joyce, widowed, pining for another resident, but surely not as innocent as she seems; Ibrahim, a former therapist who understands the darker side of human nature; and Elizabeth? Well, no one...

When an old friend, who has been accused of stealing millions of dollars' worth of diamonds, desperately needs her help, Elizabeth and her friends go up against a ruthless murderer who wouldn't bat an eyelid at knocking off four septuagenarians.