The Man Who Died Twice by Richard Osman

The members of the Thursday Murder Club find themselves embroiled with the criminal element once again when Elizabeth's ex-husband (a fellow spy) asks for her help in recovering diamonds that he's been accused of stealing. Elizabeth and her friends Joyce, Ibrahim, and Ron embrace the chance for some excitement in their everyday lives. They also again enlist the help of family members and local cops Chris and Donna in their investigation. A thoroughly enjoyable second book in the series.