Room by Emma Donoghue, We Need to Talk About Kevin (for the psychological complexity, not the violence), and Little Fires Everywhere by Celeste Ng.
4.6/5 Emotional toll: High. Keep tissues nearby. Best read: In two sittings (Parts 1-5, then 6-15+Plus) with a cup of tea and a willingness to call your own mother afterward. A Mothers Love -Part 1-15 Plus-