Someone is writing mean messages about Emelyn and other kids in her grade on pieces of paper and sticking them to lockers and bathroom walls. When Emelyn discovers a classmate hiding in the bathroom crying about the mean words written about her, Emelyn brings this problem to The Invincible Girls. Together, they decide to fight the negativity with positivity!

Emelyn, Laura, Ruby, and Myka spread words of kindness and cheerful images all over the place to cancel out the negative ones. But they keep running into speed bumps along the way--and Emelyn isn't sure she's the right person to lead the charge. Can the girls help stop the bullying in their school? And can Emelyn ultimately find her own voice?