A rich Frisian farmer has been murdered in Amsterdam and police duo Grijpstra & De Gier are sent to investigate. Adjutant Grijpstra has problems at home again and is happy to leave for Friesland to investigate the murder. Sgt. De Gier finds the Frisian Hylke much more interesting than the murder case. In Leeuwarden there is a real Chinese war and a brutal robbery at the cattle market. Suddenly there is that friendly rattling, asthmatic rat who provides an unexpected solution.
Former Amsterdam police detective Floris Wolfs has been transferred to the police department of the south-Dutch country town Maastricht. His metropolitan experience nicely complements the local expertise of his new country colleagues, who know the folks. Slowly he fits in, while solving countless crimes together with his female partner Eva van Dongen.