Ten years ago, an unsolved crime occurred, and the Thursday Murder Club takes on its investigation. They encounter the riddle of the disappearance of Bethany Waits, a well-known television host. At the same time, Elizabeth receives an ultimatum from her enemy: kill—or be killed. While she battles her conscience, the rest of the club and their new acquaintances try to unravel a new mystery involving a TV star, a money-laundering expert, and a former KGB colonel. The question is whether they’ll manage to find the answers and save Elizabeth before the killer delivers the fatal blow.