Kafka On The Shore by Haruki Murakami.
All of his books are a little odd but this one is truly baffling. Compelling story told using beautiful language and I kinda love it but I don’t understand it at all. I spent a few years post-read encouraging others in my circle to read it as well so we could “WTF?!?” at each other about it.
Totally came here to say Kafka On The Shore but I’m giving you a big ol’ head nod for this.