In a tranquil retirement village, four dynamic septuagenarians—Elizabeth, Joyce, Ibrahim, and Ron—make up the Thursday Murder Club, a covert group that meets weekly to dissect cold cases. Their routine is delightfully disrupted when a local developer is found dead, thrusting them into their first active murder investigation. As the body count rises, these charmingly cunning retirees must race against time to apprehend the killer, proving that age is just a number when it comes to solving crimes.