Mia is upset when her parents tell her she's too young to go to a concert without adult supervision. She's old enough to help run a cupcake business! Why can't her parents see that she's also responsible enough to do whatever she wants? And just when she's reached a compromise with her parents (her older brother Dan will go to the concert with her), Mia finds out she's being cyber-bullied on social media. It's the Cupcake Club to the rescue as they all help Mia solve her online bullying mystery!