Chaos is raining down on Mayflower High, just as the 3 O'Clock Club has finally remembered that they're a club after all! The portal is in overdrive, popping out monsters from the students' collective unconscious. The scariest monster is just around the corner: GRADUATION. If the Clubbers are going to shut this thing down once and for all, they'll need club captain Arch to do some serious splainin'. How has this portal continued, not just for semesters, but generations? And what does Arch's long-lost sister have to do with it?