The Secret Keeper is a cozy antique mystery book written by Kate Morton. It tells the story of Laurel Nicholson, who witnesses a shocking crime in her childhood. Decades later, Laurel becomes determined to uncover the truth behind that fateful day, leading her to a hidden family secret and a connection to an antique locket. This gripping and emotionally charged novel is a must-read for fans of cozy mysteries and family sagas with a touch of history.