Corporate innovation, to borrow from Winston Churchill’s description of Russia, is a riddle, wrapped in a mystery, inside an ever-growing cloud of hype. Finding substantive guidance is made even more difficult by the dizzying array of books on the topic, which too often value anecdote and feel-good advice over rigorous application. Fortunately, for those struggling to increase their own innovation capacity as well as that of their organization, there are several books that can help solve this puzzle. Following are 12 hidden gems and forgotten classics from key categories within innovation.