Day 4 - Favourite Book

Hrm, that would be a hard one as I've never really found a book that I liked so much I've read tons, but the only one I can think of at the moment is 'Equal Rights' by Terry Pratchett. Terry's books are great fun to read and I'm on my 12th but it disappoints me that you don't see half the characters ever again like in Equal Rights, Pyramids, Sorcery, Small Gods...

I'm really the wrong person for this question.