The years pass but the police have not given up on finding the double murderer. After a change in the law in 2019, the police are given the opportunity to use commercial genealogy databases to find the perpetrator.

On June 12, 2017, an elderly couple is found brutally murdered and taped up at home on their farm outside Mantorp. To solve the murder, the homicide investigators must now use meticulous police work in the class of CSI.