Things are slow at the cupcake shop this summer, and so when Mia's dad invites her on a long weekend trip to meet some of his college friends, she jumps at the chance--especially when she hears they have daughters her age. It turns out the girls work in an ice cream shop. Not only does Mia end up making new friends--she comes back with a new invention for the Cupcake Girls: an ice-cream cone cupcake!