Fermat's Last Theorem begins with Pythagoras, goes through Fermat's positing of his theorem, the attempts by Euler and others to solve it, and culminates with Andrew Wiles's solution. It is generally entertaining and has the occasional equation, with a few more in the Appendix. But most of the relatively light analytical machinery in the book is devoted to ancillary problems or general illustrations, Singh does not even go beyond an extremely superficial description of the main feature of Fermat's proof in the case of n=4. Instead a lot of the space is filled with detours that are often found in these sorts of books, from the role of women in French mathematics in the 19th Century to the puzzle fad in the early 20th Century. In that way this book fell short of Singh's Big Bang which felt more focused and a little more thorough in trying to describe how scientists discovered what they did about the big bang.