Red Riding: The Year of Our Lord 1980

As a serial killer claims their 13th victim, the West Yorkshire police force is rocked by rumors of corruption. To tackle the case, a team from outside, led by Peter Hunter, is brought in to work with the local officers. Despite facing resistance, Hunter persists and uncovers a potential new lead, suggesting that one of the victims may have been killed by a different perpetrator. This development sparks a series of late-night phone calls, another murder, and attempts to undermine Hunter's investigation, suggesting that he may be getting close to uncovering a dark secret within the force, rather than the serial killer. As Christmas approaches, the stakes grow higher.