12-year-old Sue is rather a loner. As a result of an accident in the chemical laboratory in which her mother works - Sue gains the unique ability to become invisible. This skill will quickly be useful to her because Sue's mother is kidnapped.

Together with their friend Kaja, a brilliant inventor and colleague Tobi, they set off on a rescue mission. You must not only free Sue's mother, but also expose the conspirators behind the abduction.