Not easy to rate. It's not a mystery/thriller so much as an exploration of how inter-generational mental illness impacts upon family relationships. In the doing it makes for characters (people!) who are not easy to warm to. Emma Healey crafts a fine sentence and the varying chapter lengths emphasise the fractured, on/off mother/daughter relationship. It's good but I wasn't struck by the ending and all-in-all I found it a bit... unrelenting.