I have to admit that I was disappointed to find that this wasn't more of a mystery. When I first heard about this book, it was described as a kind of psychological thriller. But in fact, there is very little mystery at all. You find quite early on what happened to Christopher, and more of the story is devoted to Isabella and her internal monologue. She's an interesting character, but I found the story dragged quite a bit and was left fairly unsatisfied at the end. If you like books that are a kind of deep dive into the psychology of a marriage and/or the end of a marriage, this may be of more interest to you, but it wasn't what I was looking for. 
 Full review posted on Women Write About Comics