Based on a true story.
When a shocking double homicide goes unsolved for 16 years, a detective teams up with a genealogist to catch the killer before it becomes a cold case.
After a double murder sends shock waves through a quiet Swedish town, lead detective John promises the grieving families that he will find the killer.
As weeks turn into years without answers and his home life slowly falls apart, a desperate John turns to an unlikely ally to help crack the case.
John and Per's investigative efforts are obstructed by their clashing personalities. A prying journalist adds to the pressure.
With everyone nearing the ends of their ropes, a revelation from an unexpected source leads to a breakthrough in the case.
