Through textually grounded "reverse engineering" of Sun Tzu’s ideas, this study challenges widely held assumptions. Sun Tzu is more straightforward, less "crafty," than often imagined. The concepts are more structural, less aphoristic. The fourteen themes approach provides a way of addressing Sun Tzu’s tendency to speak to multiple, often shifting, audiences at once ("multivocality"). It also sheds light on Sun Tzu’s limitations, including a pervasive zero-sum mentality; focus mostly on conventional warfare; a narrow view of human nature. Sun Tzu’s enduring value is best sought in the text’s extensive attention to warfare’s information aspects, where Sun Tzu made timeless contributions having implications for modern information warfare and especially its human aspects (e.g., algorithm sabotage by subverted insiders). The text points opportunities for small, agile twenty-first-century strategic actors to exploit cover provided by modern equivalents to Sun Tzu’s "complex terrain" (digital systems, social networks, complex organizations, and complex statutes) to run circles around large, sluggish, established institutional actors, reaping great profit from applying Sun Tzu’s insights.