I love a story about a mother and daughter relationship and bonus points if the story is a thriller. The author did such a great job at examining the oftentimes fraught bond a mother and daughter can have and Catherine and Ruth have a very complex dynamic. These two are very close, basically on a dysfunctional level and the unraveling of years of secrets between them was both fascinating and sad. This is mostly a slow burn leading up to an intense conclusion with pace picking up in the last bit. The audio narration by Kate Mara was excellent and she delivered a solid performance that captured the characters emotions perfectly.