Absolutely phenomenal story, my favorite JJBA story other than Part 7. If you liked Part 4, you'll love this novel. Just like Part 4, it's a slow burn story with an absolutely insane climax and some of the rawest emotion I've seen in fiction. This novel is set a year or so after Part 4, and is another murder mystery like Part 4, except unlike the villain of Part 4, The Book's villain is actually the (anti-hero) protagonist, and Part 4's cast are side characters in the story. Also unlike Part 4's villain, this villain's motivations are deeply emotional and arguably justified, and much ofthe book is dedicated to flashbacks explaining those motivations. Overall, I highly recommend giving it a read!