The book is not tied to an end, the end is left to the reader. Some of the questions were not answered. That's why it's 7/10.
This novel is about a man named Tsukuru Tazaki whose surname does not have any color name in it. He used to have 4 other friends and throughout the book he addressed them as "white" "black" "blue" and "red". One day, they all cut him out of the group without any reason. After 16 years Tsukuru (36) meets a woman named Sara (38) and Sara tells him that he should contact his old friends and ask about that incident. She feels like somehow he could not get over what he went through. He decides to find them and talk and guess what?
!Spoiler below!
You could actually never guess because it was all slander. "White" said that Tsukuru raped her and the others (even though they didn't believe her) agreed to cast out Tsukuru. " "White" had psychological issues and they wanted to support her this way. We don't know why she said such a thing and chose Tsukuru as a victim though.