Overall, I really loved this book. I listened to the book, and the two readers they chose for Ren and Cathy's chapters suited the story really well. The story was hard to listen to, at times, with this looming threat of others preying on Ren's psyche that became reality. But I was hooked. Though Ren was definitely a sharp and guarded character, her narration of her life made me ache for her, making the ending of the story so cathartic. The main criticism I have was the pacing felt off at some points, and while it never dragged there were some drawn out parts. But, mostly, I really liked Chlorine. 

Edit: bumping this up to 5 stars, it's been weeks and I can't stop thinking about this book.......