The Little Book That Still Beats the Market (2010) by Joel Greenblatt
This book is a slightly updated version of the author's 2005 book, with a new introduction and afterword. The core idea presented in the book is a "magic formula" for investing, which involves finding stocks that are highly ranked based on a combination of earnings yield and return on invested capital. The rationale behind these criteria is that a high return on invested capital is a sign of good management and a high earnings yield is a sign of a bargain-priced stock. The combination purportedly allows investors to identify well-run companies whose stocks are trading at bargain prices. Backtesting of an investment strategy based on the magic formula revealed that it handily outperformed the broader stock market for many years. It is an interesting approach that might be a useful supplement to one's investing strategy, but it might also give some readers the mistaken impression that successful investing can be achieved simply by applying the magic formula, without regard for other important quantitative and qualitative data about a company.
Note: I read this book in April 2013.