Unpopular Opinion: The only reason I read this is because of HBO making the miniseries with some AMAZING ACTRESSES. The series will fair far better than the book. 
 Things I liked: 
 - Some good female characters. No matter how dramatic or catty or frivolous they were, I came out liking each one of the characters. 
 - Realistic relationships between spouses, but MOSTLY between parents and their children. YES. This was done right, particularly the Madeline/Abigail relationship. 
 Things I didn't like: 
 - I'm not one for mom drama in real life, and this book is 98% mom drama. It's tedious and just as boring as I would imagine it to be if I engaged in it. 
 - This book is too long. I skipped roughly 100-150 pages between 250-400ISH and missed nothing in the plot. The only thing I missed was characters finding out information that had already been revealed to the reader. And because I'm not a dimwitted twit, I put 2 and 2 together and missed NOTHING. 
 - At first I liked the structure - narrative then police interview, but by the end, I know now that the interview lent 0 pieces of information to the story. It's all fluff. A novel idea, but it could have been put to better use. 
 Have I read one of Liane Moriarty's books before? No. Will I read one again? Doubtful. It just lacked something for me. 
 BUT if you're into commercial fiction/mystery stuff, pick it up and judge for yourself!