A mystery malevolence is stalking the Excelsior School playground and classrooms. People are vanishing, valuables are being pilfered, and students are finding themselves instantly transported to the oddest places: lockers, closets… the roof? Can the super-kids of ps238 find out what’s going on and how to stop it before the school becomes uninhabitable? And will Guardian Angel recover from her devastating illness? Pick up ps238 #17, because class is in session!