Piper Pájaro and Sloane MacBrute are two 13-year-old girls with very different lives but very similar secrets. Popular, outgoing Piper is strong-like, ripping-the-doors-off-cars strong. She longs to be a superhero, even if she tends to leave massive messes in her wake. Sloane, on the other hand, is snarky and super-smart. Like, evil-genius smart. To help her family, she has to put those smarts to use for her villainous grandfather. When a mission...