3.5 rounded up. This story was a lot of fun at first. Perfect cross between One of Us is Lying, Pretty Little Liars, and the Breakfast Club. The thriller aspects are well executed as small "twisted secrets" are revealed as the group tries to figure out an escape. It does lead to some pretty big plot twists. My biggest gripe with this book (it could have easily been a 4 or 4.5 star read). Unfortunately, they reveal the true mastermind BEFORE we get mastermind's POV and then they still try to disguise the person for some reason even though we already know who it is. So it was very anti-climatic by that point. BUT until that point I absolutely loved it.