M is an alternation of folds aligned by holding your album up with the pages slightly spread apart ("17 Seconds" by The Cure). From an edge view, the album cover should make a "W" pattern. If you see an "M," you simply need to execute a scorpion pose. If necessary, refold to make the "W" pattern. Now you are ready to write a movie script.
See also What should I do if it folds in on itself (recursively)?