This is an enjoyable book even if you don't know much about mathematics. I took it with me to Capri last summer, and got a sunburn when I was too absorbed in the text to move into the shade! The plot moves quickly, there are plenty of interesting characters and exotic locales, and though the equations can be hard to follow (for me, anyway!), the author never lets you get bogged down in them. Like Lewis Carroll, another author/mathematician, Morris knows how to make you think without realizing you're thinking. That sounds like exalted company, but I, for one, am anxious for the sequel.