The body of an elderly woman was found in a Copenhagen park, killed by a blow to the base of the skull. At first glance, an ordinary robbery, the criminal did not calculate his strength... However, this case suddenly became interested in the Vice Commissioner of Police Karl Merk. Of course, “fresh” crimes are not his concern, they are dealt with by the homicide department, and the employees of the “Q” department are raking up old “hangings”... But it turned out that exactly the same murder - down to the smallest detail - happened more than 10 years ago; Only then did the young woman die. The culprit could not be found. What is this - a coincidence or a continuation of the bloody series? A new challenge for Mörk and his team...