S Has Rendered Party School Totally Useless to S Demonstrates How to Be Naughty and Nice Summary

While the older students are planning their graduations, Dan's little sister Jenny is searching for a new school. She and her father, Rufus, go to visit a notorious party school called Hanover, where Serena once spent some time. However, Serena has apparently ruined the school's party reputation, since she got in so much trouble that the rules have been made all the stricter. This puts Jenny off, and she and her father head over to Croton, another school. Meanwhile, Dan receives an email from Pierre Papadametriou, a professor at Evergreen College, where he is going in the fall, offering him a summer job.

Dan then goes to visit Blair and Vanessa's apartment in...