Hole in the Heart (S04E03)

Tony Hill lends his expertise to the police as they probe an odd string of murders. The victims—a property developer, a bishop, and a judge—were all viciously slain, with the perpetrators taking their own lives right after. Initially, Tony suspects a link to the Freemasons, but soon discovers they are facing a religious cult that venerates suicide. He deduces that the sect's leader will be a white male and that there will be six followers based on the religious imagery. The challenge now lies in identifying these individuals and finding them amidst the chaos.