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Kirsten closes in on the killer, but their capture reveals the grave threat that Vigil faces. On the submarine, Amy makes a terrifying discovery.
Episode Title:Episode 4
Creator:Tom Edge
Stars:Adam James, Anjli Mohindra, Connor Swindells, Gary Lewis, Lolita Chakrabarti, Martin Compston, Paterson Joseph, Rose Leslie, Shaun Evans, Suranne Jones
Networks:BBC One
