For having a limited cast and setting, this book does a good job creating suspense. Ruth Ware is known for her plot twists and big revelations and this book was no exception. The end felt a bit like Scooby Doo unmasking the villain, along with three (by my count) pretty big twists.

One thing that struck me as odd: the fact that this was a "smart/wired" house (tech-wise) seemed to feature prominently, and it seemed to blow the protagonist's mind. I had to check to see when it was published (2019) because the Internet of Things should no longer be a novel concept. A refrigerator that keeps a grocery list? Programmable lights and music? Rooms that can be monitored via cameras? Um, yeah. I think most people probably know someone who lives this way. Now if this had been written in 1991, I might have been more impressed .