Can I give this six stars? I'm giving it six stars. Try to stop me. 
 "Beauty and the Beast" meets "Tam Lin" with a hint of "Cinderella" in this wonderfully written (very adult) fairy tale. With a heroine who's more like Katniss than Belle, fascinatingly layered characters, and intricate worldbuilding, this book will keep you up past your bedtime. 
 Going into this book, I was terrified I wouldn't like it. Every single review I've seen was glowing, and I always worry that I'll be the odd one out. By halfway through, I knew it was going to be that rare creature that makes me insanely jealous that I didn't think of this first. It's also more adult than I was expecting (I thought it was YA--it's really not). 
 Feyre is a phenomenal protagonist, strong and capable yet filled with self-doubt. The other characters, even minor ones like Feyre's sisters, are layered; almost nobody is who they appear to be on the surface. Even the evil faerie queen has her reasons (though, to quote Brooklyn 99: "Cool motive. Still murder.") Because it's a fairy tale, the evil queen is very very evil--almost mustache-twirlingly so--but she doesn't necessarily do what she does for the heck of it. It's easy to see that under certain circumstances, Feyre could have turned out that angry and vengeful, as well. 
 This is one of the best-done fairy tale retellings I've ever read--and I've read a lot of Robin McKinley.