Recommendations: (1) Read The Thursday Murder Club before you read this one. (2) Keep in mind the character introduced at this book's very beginning, as the book's final chapter may not make sense otherwise.
The "club" members at the elderly care facility of Coopers Chase are Joyce, Rob, Ibrahim, and Elizabeth, and they're almost back to normal operations after their previous adventure. But an unexpected guest appears from Elizabeth's black-ops past appears, introduced by a cryptic letter slipped under her door.
But that's not all: a group of young thugs viciously attack Ibrahim, leaving him with injuries both physical and mental. Donna and Chris, the oft-befuddled cops from the previous book are here trying to take down Connie, a nasty local drug kingpin. And a grand-living international criminal with the misfortune to have been in the care of diamonds worth £20,000,000; technically belonging to the American mafia. Now missing.
And it somehow gets tied together at the end.
Osman writes with a great blend of humor, sympathy, and suspense. If you think that a book revolving around four British elderly people might be too cozy for your taste, worry not: Philip Marlowe would give an admiring, albeit cynical, thumbs up to this crew.