Brooke and Madeline plan to be best friends forever, until challenges in middle school cause cracks in their relationship, and they must determine if the friendship is worth salvaging.

As part of a school project, Lizbeth is working in Mickey's mother's beauty salon for three weeks and Mickey, fearing that her new friend will outshine her, tries to prove herself by dying a customer's hair on her own.

After thirteen-year-old Mickey and her friends set up a beauty blog, where they provide readers with do-it-yourself tips for at-home beauty treatments, Hello, Gorgeous! suddenly has a steady stream of customers with hair disasters in need of repair.