8-year-old Mabel likes her room to be neat, her day to be planned, and her life to be organized. If only she could organize her younger sister! 5-year-old Violet is messy and out of control. Just before Violet starts kindergarten, a surprise visit from mysterious Uncle Vartan exposes a big secret; there's magic in their family. Mabel is sure she'll know just how to use her powers. After all, she's used to being mature and responsible. But her orderly world begins to fall apart when she learns she's not the one with magic — it's adorable, annoying Violet. Life will never be the same!