Counterfeit money is circulating in the city! Many people are affected by this, even Karl has been cheated out of the earnings from his vacation work. TKKG can't stand by and watch any longer, so they immediately set out to find the counterfeiting gang. Is it possible to copy banknotes with a good color copier? Or is director Münzer somehow involved? Or should the four friends rather follow the trail to the "Rose of Capri"? Tim, Karl, Klößchen and Gabi must now become real money specialists. What distinguishes fake from real banknotes, and where and how do the counterfeiters print them?
