An 800-word, untitled short story, unofficially known as the Harry Potter prequel, was written by J. K. Rowling in 2008 as part of a charity auction event, for which it fetched £25,000. The story recounts an encounter with Muggle police experienced by Sirius Black and James Potter, taking place before the events of the Harry Potter series. I do not own anything, all rights to J.K. Rowling