concludes with an intense high-stakes investigation involving bioterrorism and deep-seated personal betrayals. Episode Overview "Pandora's Box" Release Date: January 8, 2025 (UK/Channel 4); July 20, 2025 (US/PBS) Running Time: Approximately 46–47 minutes Core Plot:
In typical fashion for a British crime drama finale, Episode 6 usually raises the stakes significantly higher than the "case of the week" episodes. While specific plot details can vary by region (as Channel 4 sometimes adjusts broadcast orders), the finale generally revolves around a case that feels deeply personal to the detectives or threatens the existence of their unit.
The "terrorist" was actually a former undercover police officer who had gone rogue. The real killer is revealed to be Superintendent Zara Blackwood (who was also using the name Flora ), the victim's ex-wife, who murdered him in a jealous rage using stolen anthrax.