The Yiddish Policemen's Union by Michael Chabon

Read this book. Avoid reading any reviews. Do not read the dust-jacket. Do not wait for friends to describe it enthusiastically. Go get it and read it right away. Be puzzled and then surprised and then delighted. Do not force me to come to your house and bang you a tea-kettle over this.
The only excuse for not reading this book right away is that you are currently reading this one. Read first. You can thank me later.