A week ago, the biggest Harry Potter news of the summer was next month’s release of the final film in the series, Harry Potter and the Deathly Hallows: Part II. Now, Rowling has given Potterphiles something else to look forward to—and it’s still a mystery.

Rowling gave coordinates to 10 Harry Potter fan sites, which were posted yesterday. Fans could enter the coordinates at another Web site, which uses Google Maps technology; when sitegoers zoom in on each coordinate, a letter from the Pottermore.com URL can be found. Fans who found the letters at all 10 coordinates could then piece together the name of the new site.

For now, Pottermore.com consists of a pink placeholder page with the words “coming soon” and Rowling’s signature. A spokesperson from Rowling’s PR agency told the Bookseller, “It is not another Harry Potter book but we cannot reveal any more at this stage, fans will have to keep an eye on the website. It will be launching soon.”