When Sunny Sweet, age six, devises a science experiment that requires her big sister Masha to look weird all day, Masha will try almost anything to get them home from the science fair without causing a scene.
Follows eleven-year-old Masha and her "evil genius" little sister, Sunny, through one very adventurous day, as Masha faces scary situations, meets new people, and gains new insight into life with her hardworking, single mother.