The Sect — Catriona King

When four bodies are found in rural County Down, drowned and wrapped in cling-film, it seems clear that the team is dealing with a psychopath. But their investigation unveils something even more sinister, as history and belief combine in a killing spree that reaches half way across the world. Meanwhile, one of the squad's old cases is resolved in an unexpected way and two of Craig's team members struggle with demons of their own. The Sect. Be careful what you believe.