Well. This was interesting. 
 If anything, I appreciated a Gone Girl-esque story (but not entirely Gone Girl in that I actually could like the woman and not hate her as much as I hate the guy of the story. Really. He's absolute garbage). The psychological aspects of it were interesting, too, but there was a lot of excess detail that I think was meant to be part of the psychological build-up and explanations that could have been done away with. 
 In any case, I finished this within an hour, so take it as you will.