What book do you think is the definitive work on Cleopatra?

I think 'Cleopatra' by Michael Grant is the most interesting full-length biography of her that I have read.

'Cleopatra, the Life and Death of a Pharoah' by Edith Flamarion is a very good short book about Cleopatra, with loads of pictures, it's an excellent short introduction to Cleopatra with very interestin illustrations. It also has an interesting section of things people have written about cleopatra over the centuries, from her own day up until the 19th century.