Everyone in my family has killed someone. Some of us, the high achievers, have killed more than once. I’m not trying to be dramatic, but it is the truth. Some of us are good, others are bad, and some just unfortunate. I’m Ernest Cunningham. Call me Ern or Ernie. I wish I’d killed whoever decided our family reunion should be at a ski resort, but it’s a little more complicated than that.

Geoffrey Lushington, Mayor of Marlow, dies suddenly during a Town Council meeting. When traces of aconite—also known as the queen of poisons—are found in his coffee cup, the police realize he was murdered. But who did it? And why? The police bring Judith, Suzie and Becks in to investigate as Civilian Advisors right from the start, so they have free rein to interview suspects and follow the evidence to their heart’s content, which is perfect because Judith has no time for rules and standard procedure. But this case has the Marlow Murder Club stumped.

In a peaceful retirement village, four unlikely friends meet weekly in the Jigsaw Room to discuss unsolved crimes; together, they call themselves the Thursday Murder Club. When a local developer is found dead with a mysterious photograph left next to the body, the Thursday Murder Club suddenly find themselves in the middle of their first live case.

Relentless phone calls interrupt the peace of a warm August morning in Three Pines. Though the tiny Québec village is impossible to find on any map, someone has managed to track down Armand Gamache, head of homicide at the Sûreté, as he sits with his wife in their back garden. Reine-Marie watches with increasing unease as her husband refuses to pick up, though he clearly knows who is on the other end. When he finally answers, his rage shatters the calm of their quiet Sunday morning.

Judith Potts is 77 years old and blissfully happy. She lives on her own in a faded mansion just outside Marlow, there’s no man in her life to tell her what to do or how much whisky to drink, and to keep herself busy she sets crosswords for The Times newspaper. One evening, while out swimming in the Thames, Judith witnesses a brutal murder. The local police don’t believe her story, so she decides to investigate for herself and is soon joined in her quest by Suzie, a salt-of-the-earth dog-walker, and Becks, the prim and proper wife of the local vicar.