No One You Know by Michelle Richmond
Her sister was murdered. The killer was never found. Until now... All her childhood Ellie Enderlin had lived in her sister's shadow. But then Lily was murdered and their family changed forever. Now, decades later, Ellie comes into possession of Lila's lost notebook and has a chance to finally discover the truth about her sister's death. But her search for justice will lead her to uncover her sister's darkest secrets... From the Sunday Times bestselling author of THE MARRIAGE PACT, a Richard and Judy Book Club Selection.