Ali is a watcher. She likes to watch people around her. She is an introvert in every way. However, she is also odd, eccentric, and snarky. She loves people and is a genuinely nice person. 
 Gabriel is an asshole. Honestly, the biggest reason this isn't a 5 star is because I didn't connect with Gabriel. The writing is great but he and I just were not seeing eye to eye. 
 So back to the story, when Ali and her secret new neighbor catch each other's glances through the windows, without being able to see each other's faces, they come up with an anonymous arrangement to satisfy them sexually. 
 The only other reason I opted not to give this one a five star is (view spoiler)[because you know very early on that Gabe is Q, and it takes WAY too damn long for them to figure it out, and then the stupidity of them not ending up together immediately threw me off. I wanted more than the one chapter at the end of them together. (hide spoiler)] 
 The writing is very good, and is written like a voyeur in the sense that it is extremely descriptive. 
 I loved Ali and I loved the story but it just wasn't quite a 5 star for me.