Oh, I just loved this book. Gideon is one of the best protagonists I've read in ages; she's snarky and stubborn and incredibly entertaining. Her dynamic with Harrow that is simultaneously filled with intense hatred and co-dependency is so interesting and provides all kinds of interpersonal tension not even factoring in the other Houses. Speaking of the other Houses, even if they aren't all the most likable, they are all strong characters in their own right and each bring something unique to the story. The worldbuilding, as is often said about this book, is a little confusing, but I actually really enjoyed it. It was like a puzzle to figure out, and it helped with the immersion so much since Gideon wasn't dwelling on explaining things she already knew. The plot, despite the characters being somewhat aimless for some periods, was never boring as tension between the characters kept things moving when they were stuck plot-wise. The twist at the end was amazing and shocking and horrifying, and I've already got Harrow checked out in my library.