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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.
Suranne Jones
DCI Amy Silva
Rose Leslie
DS Kirsten Longacre
Romola Garai
Eliza Russell
Gary Lewis
DSU Colin Robertson
Chris Jenks
Callum Barker
Jonathan Ajayi
Wes Harper
Amir El-Masry
Daniel Ramsay
Oscar Salem
Captain Sattam Abdul Kader
Dougray Scott
Marcus Grainger
