I love alternate history stories...big fan of Turtledove. The Yiddish Policemen's Union is a murder mystery. It has a bit too much yiddish idiomatic language/expressions for my taste...jews with yiddish language background could be turned off... I hope that non-jews will not lose patience with the yiddish since the story is very interesting. The title, by the way, is a reference to the detective's membership in a virtually meaningless (to the story line) organization; the author had to to call the book something but a great choice it wasn't.