In this book, the classic of Austrian children's literature, Christina Nöstlinger, is waiting for a new batch of stories about Franz, who is already very soon nine years old. Franz is in the second grade, and everything is wonderful with him, except for one thing: a boy named Joshka offends Franz all the time. Joshka is a terrible braggart. He teases Franz that he does not have a four-color pen, designer, camera or anything else that he himself has. Once Joshka acted very ugly: knowing that Franz did not have a grandfather, he took it and boasted of his own. Franz could not stand it and replied that he also had a grandfather. But Joshka did not believe him. The guys rushed to defend Franz and even argued that he did not lie and would soon show everyone his grandfather. So what should Franz do now? Where can he find a real grandfather? It looks like only one person can save Franz - his beloved grandmother...