It's a long ride to the beach town where her cousins live, but eight-year-old Mabel always loves a car trip. She's a champion packer, prepared for any emergency. But nothing could prepare her for what happens when her family meets up with Zoe and Mya. Mabel's cousins are the first people to see five-year-old Violet for what she really is. And, for the first time, Mabel's biggest worry isn't keeping Violet's secret under wraps. It's what her cousins see in her!

It is sibling rivalry with a magical twist!