At the height of the Harry Potter novels’ popularity, I asked a number of people why those books in particular enjoyed such a devoted readership. Everyone gave almost the same answer: that author J.K. Rowling “tells a good story.” The response at once clarified everything and nothing; of course a “good story” can draw a large, enthusiastic (and, at that time, impatient) readership, but what does it take to actually tell a good story? People have probably made more money attempting, questionably, to pin down, define, and teach the best practices of storytelling, but at the top of this post, we have a revealing scrap of Rowling’s own process. And I do, almost literally, mean a scrap: this piece of lined paper contains part of the handwritten plot spreadsheet she used to write the fifth Harry Potter novel, Harry Potter and the Order of the Phoenix.