Seventy-seven-year-old Judith Potts is blissfully happy. She lives alone in a faded mansion in Marlow, sets crosswords for The Times, and there’s no man in her life to tell her what to do or how much whisky to drink. One evening, while out swimming in the Thames, Judith witnesses a brutal murder. When the local police don’t believe her story, Judith and two unlikely friends decide to investigate for themselves. Together, they are the Marlow Murder Club.

Sydney, 1965: After a chance encounter with a stranger, mild-mannered tea lady Hazel Bates becomes an accidental sleuth, stumbling into a world of ruthless crooks and racketeers in search of a young woman she believes to be in danger. In the meantime, Hazel's job at Empire Fashionwear is in jeopardy. The firm has turned out the same frocks and blouses for the past twenty years and when the mini-skirt bursts onto the scene, it rocks the rag trade to its foundations. War breaks out between departments and it falls to Hazel, the quiet diplomat, to broker peace and save the firm.

Fiona, Sue, and Daisy, three retired ladies who volunteer at the local charity shop, Dogs Need Nice Homes, can’t believe their favorite customer is dead. Eighty-six-year-old Sarah Brown was found murdered in her hallway by her delivery man, a domino clutched in her hand—with a name scratched on it. When another person is found dead with a domino in their hand, and with the police making no progress, the ladies will need to help unmask a serial killer. At least they have Fiona’s scruffy-haired terrier cross to assist them.

The village of Badger's Drift is the essence of tranquillity. But when resident and well-loved spinster Miss Simpson takes a stroll in the nearby woods, she stumbles across something she was never meant to see, and there's only one way to keep her quiet. Miss Simpson's death is not suspicious, say the villagers. But Miss Lucy Bellringer refuses to rest: her friend has been murdered. She is sure of it.

A wealthy woman strangled six hours after she's arranged her own funeral. A very private detective uncovering secrets but hiding his own. A reluctant author drawn into a story he can’t control. What do they have in common? Unexpected death, an unsolved mystery and a trail of bloody clues lie at the heart of Anthony Horowitz's new thriller. Spread the word. The word is murder.