Colorless Tsukuru Tazaki, and His Years of Pilgrimage, by Haruki Murakami.
There you have it. A one word review. What else can one say?
It is the novel that every novelist wishes he himself had written.
Oh, one more thing. When a writer knows his own characters so well that he can describe the dreams they have at night and cause the reader to believe that these were in fact the dreams dreamed by that character - well, then, you know you have seen a work of uncommon talent.