On the surface the four colour theorem may seem like a dull story for a book like this. But Robin Wilson does a great job of making this a fascinating story. I was hooked from the start. It doesn't get too technical but nevertheless you do get an idea, though perhaps not a complete understanding, of how and why the proof worked. A great read for any 'popular science' fan. If you enjoy Simon Singh, Ian Stewart and the like, you'll like this too.