This book is a difficult one to review and rate because the middle and ending sections were very different from the beginning. The book started out as a nail-biter of a thriller and I read the first 100 pages or so in one sitting. The middle section was like a Harlan Coben standalone in which the wife can't figure out why he would leave their daughter and loving marriage, though the pacing lagged because much of this section was spent puttering around the house and talking to her sister. The ending picked up a bit. If the whole book was like the beginning I would give it 5 stars. If the whole book was like the middle I'd give it 3, so will settle on 4.