Pick up the hair tie on Jo's desk and it will take you to the door, leave the site idle for a few minutes and Peeves will come by and leave keys behind. Grab a key and drag it to the door lock. When you get the right key it will turn and you will be able to open the door. Sorry, no way to know which is the right key except trial and error. Once you get the right key and open the door you see her messy desk, there is a drawer handle, click it and drag the drawer open. Pick up the magnifying glass and click it over the folder on her desk. You'll get a riddle, the answer is chapters-click the spaces on the bottom of the page and type chapters. Another folder will apppear on the screen with pages sticking out the top of it, you can pull the pages out one at a time and you will get three chapter names. Have fun!