Grunhilda the Witch has a weakness, a tiny soft spot on her black and crusty heart. She continues to hide the nice feelings she has when she gets a letter from former Salem Elementary student Madison. But she can't keep up the ruse for long because her familiars are onto her - and so are her ancestors! Anything that can go wrong does when Madison accidentally mixes up a positivity potion - and it starts to affect everyone in town. Birds are singing. Flowers are growing. The principal cancels school! Grunhilda hurries to mix up a potion to fix the town, her familiars, and her own black crusty heart before the positivity succeeds in making everything bright and cheerful.