The follow-up to Osman's best-selling The Thursday Murder Club reintroduces Elizabeth, Joyce, Ron, and Ibrahim, all residents of an English retirement community who have eschewed bridge and crafts for crime-solving. Elizabeth, a former MI5 agent, is surprised when an old partner (and former husband) gets in touch, but she's soon got the gang involved in a case that involves millions in diamonds and a mobster who takes no prisoners.