Fermat's Last Theorem: The Story of a Riddle that Confounded the World's Greatest Minds for 358 Years by Simon Singh

In 1963, a schoolboy browsing in his local library stumbled across a great mathematical problem: Fermat's Last Theorem, a puzzle that every child can now understand, but which has baffled mathematicians for over 300 years. Aged just ten, Andrew Wiles dreamed he would crack it.