"IK" is the abbreviation for "International Coordination". Behind it is a real existing department of the Federal Criminal Police Office, which intervenes when Germans are involved in criminal offenses abroad. An unequal duo comes into play as a special kind of holiday saver: Florian Blessing is a daredevil who likes to work alone and does not stick to the rules too strictly. Therefore, he is not very enthusiastic when Nadja Hansen, psychologist and specialist in operative case analysis, is put at his side.