After seeing this book was #2 on the NYT bestseller's list, I read the jacket and dove in. The book starts extremely well with a modern and interesting narrative. The flashback scenes are well done and at no time lose the reader.
About 2/3's of the way into the book, the characters become well defined and start to gain a mild complexity. Unfortunately that is where the development stops. In an attempt to create a dramatic ending the book takes on a sit com like aspect. The characters become one dimensional, the story line predictable and you feel the author racing to create a tidy ending.
If the author had further developed the auxiliary characters and ending, it could of been on par with similar books in this genre like "The Bridges of Madison County".