I was given an eARC for being part of Rachel's street team. The Library of Shadows hit all the right spots! From tall, dark, and sarcastic Mateo, to the rest of the ghosts, and our intrepid MC, Este. It's a little bit forbidden romance and a lot bit enemies-to-allies-the-friends-to-lovers. The found family trope is one of my absolute favorites and seeing the ghosts interacting with each other despite the decades between them was heart-warming! The mystery kept me guessing, but the clues came together nicely. No spoilers, but if you're at all a fan of The Whispering Dark by Kelly Andrew and Cemetery Boys by Aiden Thomas, the reluctant allyship trope, and/or ghost boyfriends, you'll absolutely love this atmospheric collegiate prep school book! Be sure to pre-order it or pick it up on release day. Looking forward to what comes next from Rachel!