If you thought Gideon was too confusing, I think I'd just recommend dropping the series at this point, because Harrow was infinitely more so, and I loved every second of it. It's just constant confusion pretty much all the way through, and even at the end I have so many more questions that I don't have an answer to (yet). But I love this series, with all its flawed and messy characters and relationships. Every read and reread is so rewarding.

I don't want to say anything about the plot, because I truly think these books are best experienced when you go in completely blind. Just put your trust in Muir, and enjoy the ride.