The first chapter had me hooked. Listening to it on audio as I was falling asleep was probably a mistake (I had a horrible night's sleep!) but the unsettling feeling it created had me excited for the rest. 
 From that point, the pace of the story sort of dropped off. It didn't get boring - it just became less of a mystery and more of a character study. Celeste Ng is a very talented writer - in a less capable author's hands, this could have been the story of two really unlikable parents and their angsty kids. There were definitely times I wanted to hit Marilyn and James over the head for their awful parenting skills, but I also sympathized with both of them, particularly Marilyn. I wanted to shake Nath and force him to see just how unhappy Lydia was, but I also loved how much he truly cared about his sister. I wanted to give Hannah, the poor forgotten child, all the hugs. And then there was Lydia - she could've come off as the ungrateful golden child, but her suffering was the easiest to understand and the hardest to swallow. The smothering feeling that you're not good enough, that you need to please everyone, and that no one really sees you would be enough to mess with anyone. The final revelations about her death were devastating. 
 Before I wrote this review I was going to give this 3 stars, but after getting all my thoughts out about it, I think it is worthy of 4. It was a beautifully haunting book.