白夜行

Really good book, best one I've read so far in the mystery genre. Very well worth the read, hard parts due to vocabulary and some colloquial/kansai ben, but otherwise pretty simple grammar.

Note: I recommend keeping a list of characters with the general gist of who they are, as the story progresses. Because, there's toooooo many characters and time skips, so it's hard to track, especially if you suck at kanji names like I do.