Top Ten lists

I'm working on some top ten lists..... and I must put them in print now or I'll forget what I've got.

Top four most important books I've read (not in order):
"A Problem From Hell" by Samantha Powers
Guns, Germs, & Steel, by Jared Diamond
Why People Believe Strange Things by Michael Shermer
The Naked Man by Desmond Morris

Best book ever - the only work of fiction I want to put on my empty top ten list right now:

Gaudy Night, by Dorothy Sayers