It's intricate how this author manages to present the interior dialogue of the protagonist, Matthew, as ordinary then slowly becomes more idiosyncratic and then eccentric and then downright mentally ill? Seems like an unhealthy Type 5 on the Enneagram personality system?
But that's how it creeps up on you that this narrator is not be trusted.
What I'd like to point out for those who thought the ending was too abrupt?
Read again the dialogue, conversation with the Detective Fernandez. There's something non-sequitur about Charlie's answers. Is he really guiding the collapse? It's possible that the times when he's away from the house could be surveillance? If Matthew can read Chloe's reactions doesn't her husband know as well?
The story reminds me of the movie Unfaithful (Richard Gere/Diane Lane/'Paul Martel') which also ended abruptly at a traffic signal with the police station in sight?
I gave it three stars because it slogged and bogged now and again. Plus, there's only so much interior chatter I can stand?