The Mother-in-Law by Sally Hepworth

When Lucy's mother-in-law, Diana, dies, she is in shock because they haven't had the easiest relationship over the ten years they have known each other. Lucy is married to Diana's son, Ollie, and they have three young children. The police are treating Diana's death as suspicious because at first it seemed like suicide, but the evidence soon points to murder by a family member. Who could have possibly killed Diana? The Mother-in-Law recounts the lives of the Goodwins and the up and down family dynamics since Lucy joined the family. A great read-alike for Elin Hilderbrand's The Perfect Couple and Liane Moriarty's novels.