Geraldine is an energetic, spirited second-grader with a passion for inventing. When the class bully picks on Geraldine and her friends one too many times, Geraldine devises a plan to teach him a lesson. Sorting through her parents' old gadgets and gizmos, she finds exactly what she needs to create the perfect anti-bullying shield. She and her friends work together to create something that shows the bully exactly what he looks and sounds like when he picks on other kids. Will it be enough to make him stop?