Twelve-year-old Susanne, who would much rather be called Sue, like Susan "Sue" Storm, the "Invisible Girl" from the Fantastic Four, has a problem: she is a loner at school and is sometimes simply overlooked in class. This leads to a momentous accident: in her mother's research laboratory of all places, where she is a highly qualified scientist, the disappointed Sue gives free rein to her frustration, damages the computer and causes the complex research system to fatally overheat. Mother's mysterious experimental substance bubbles and hisses, there is lightning and thunder - and suddenly Sue can make herself invisible!