Series based on the murder of ten-year-old Helén Nilsson in Hörby in 1989, a case that shook the whole of Sweden. Jakten på en mördare is the story of Per-Åke Åkesson and the reconnaissance group that solved several murders of women in northeastern Skåne and finally the unsolvable case of Helén. The series is based on Tobias Barkman's reportage book about one of Sweden's most skilled murder detectives.