Vincent Boylan (Joe Absolom) has just been arrested, suspected of being behind the brutal murder of seven girls, but the team only have a limited time to get a confession. If they can't make him talk, he could slip through their fingers. Detective Matheson (Gareth David-Lloyd), who is leading the investigation, is sent in to try and get some answers. But things soon take a horrifying turn for the worse, as Matheson and his boss Lyndon (Tracy-Ann Oberman) find out that all is not as it seems.
The mystery deepens as everyone is drawn into Boylan's sick mind games, and each twist-packed episode ends on a tantalising cliffhanger.