Great book. Till you get to Chap. 14-15 (about 40% of the way in). There it went from being quirky, mysterious, and highly enjoyable story into being implausible and disgusting over the course of a couple of pages. 
 I could handle, even appreciate, the neuroses of heroine Kate and creepy neighbor Allan, but being exposed close-up to her cruel cousin Corbin and his sociopath friend Henry was too much. This should have been marketed as horror, not thriller/suspense. That would have put me in a more receptive frame of mind. 
 I found Kate to be so likable and vulnerable that I did not want to read further, suspecting that she will become a target of Henry. Compounding her fragility with his terror would be too much for my tastes. DNF.