Lightning Girl 3: Secret Supervillain, Paperback/Alesha Dixon

Aurora Beam is a SUPER-ANNOYED SUPERHERO. She's desperate to help her mum and grandma track down the stolen precious stone that holds the key to her family's powers, but there's a DANGEROUS SUPERVILLAIN on the loose with a deep-seated desire for revenge, and not even Lightning Girl and the Bright Sparks may be a match for him or her...