Father Frost has struck. Shortly before Christmas Eve, half of Münster caught a cold. Also in court, where Chief Inspector Frank Thiel (Axel Prahl) and Prof. Karl-Friedrich Boerne (Jan Josef Liefers) are waiting for the verdict in a murder trial. Public prosecutor Wilhelmine Klemm (Mechthild Großmann) even has to break off her closing speech, and the verdict is adjourned because of the outbreak of colds. Actually, the evidence in the murder case is clear - but then a mysterious caller reports to Chief Inspector Thiel. Thiel and Boerne actually wanted to spend Christmas with family and friends, but to their disappointment they canceled. The case and the work assignment before Christmas Eve is a welcome distraction.