Is there any such thing as a good, UNBIASED biography of Adolf Hitler?

They're all either written by some neo-nazi skinhead freak who insists the guy was an angel, or other people who focus mostly on how many people were killed/tortured/experimented on in the Holocaust, or weird theories about how pervy he was, etc. I understand why this is the case but I'm wondering if anybody's ever come across a really good biography of him that's relatively free of propaganda.