"The Seven Dials Mystery" is a detective novel by the renowned British author Agatha Christie. It was first published in the UK in January 1929. The book is a sequel to Christie's earlier novel, The Secret of Chimneys, and features some of the same characters, including Lady Eileen "Bundle" Brent, Superintendent Battle, and Lord Caterham

Plot Summary: The story begins with a group of young people staying at a country house called Chimneys. One of the guests, Gerry Wade, is found dead in bed, apparently from an overdose of a sleeping drug. However, suspicions arise when eight alarm clocks, meant to prank Gerry for his habit of oversleeping, are discovered in his room, with one missing. Lady Eileen "Bundle" Brent, the spirited daughter of Lord Caterham, becomes involved in the investigation. Her curiosity leads her to uncover a secret society known as "The Seven Dials," which seems to be connected to Gerry's death. As the plot unfolds, Bundle and her allies navigate through layers of deception, hidden identities, and mysterious activities, all tied to a larger, sinister conspiracy.