"Violet and Dash are back for another Super adventure! This time, the siblings find themselves stuck in an after-school program. Everything about it seems so boring and normal, but they discover a new way to practice their powers to become even better Supers. Violet, Dash, and their friend Chance want to be ready for anything, especially when they investigate the biggest mystery of all: who left the strange and sinister notes in Chance's locker? A super villain could be closer than they think..."--Back cover.