I'll definitely give this book credit for keeping me guessing because I had no idea what was going on the entire time. I only guessed one little aspect of the final reveal. That being said, I do think that Girl on the Train (which has a similar concept) kept me on the edge of my seat much better than this one did, although that could be because I read it first and when I was younger.

One issue that I did have at the end was that the book seemed to villainize mental illness in a way and used it as a plot twist which I found so unnecessary, especially since there was no conversation or deeper analysis into the topic. I think the ending would've been just as good without using that as part of the final twist.

Overall, this was a decent thriller and definitely got me looking forward to reading every day which I haven't felt too much this year.