Rikus's grandmother is different to other grandmothers. She has her own rock group. Her hair is coloured green. She zips around in a red sports car. She is constantly in the newspapers and magazines. She goes to parties together with TV stars and state presidents. When, on top of that, Grandmother gets a part in a new film, Rikus is very excited. But a film set can sometimes be a dangerous place. Will Rikus be able to escape from the clutches of a dangerous villain and save his grandmother's career?--Translated from the back cover.