 Set in the Spanish Golden Age, it's about a kitchen maid named Luzia who is forced to hide her magic and her Jewish heritage. But when her employer discovers her magic, she's entered into a competition to find King Philip, a holy champion. She's also trained by a mysterious creature named Saint Angel. I love the magic and world building in this book, and it's gorgeously written. Like all of Bardugo's work, it'll stay on your mind long after you're done.