Vigil | Episode 4
Director: Tom Edge
Cast: Alastair Mackenzie, Amir El-Masry, Chris Jenks, Dougray Scott, Gary Lewis, Jonathan Ajayi, Oscar Salem, Romola Garai, Rose Leslie, Steven Elder, Suranne Jones
Description: : Kirsten closes in on the killer, but their capture reveals the grave threat that Vigil faces. On the submarine, Amy makes a terrifying discovery.