Theres a traitor on board HMS Vigil!

Will DCI Silva get out of this packed spy story alive?

Warning: this review containsVigilspoilers.

Vigil Episode 4 Rose Leslie Suranne Jones

Weve been expecting you.

After all, where would a Second Cold War submarine thriller be without a Piotr or a Fyodor?

What plan, you ask?

Vigil episode 3 BBC One Shaun Evans

Or perhaps that pushes them into votingforit?

Look, Im not a Russian spy, I dont know how they think.

(Piotr, I think they bought that.

Vigil Episode 2

See you on the bridge at midnight.)

Theres a traitor inVigils midst and theyre causing no end of trouble.

Then they jimmied a lock to a thing to force a nuclear reactor shutdown, for reasons unknown.

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Vigil Episode 2 Review: Deeper into the Conspira-Sea!

Atmosphere-wise, episode four didnt feel at all Agatha Christie.

The source of that glow was largelyRose Leslie, whos proving a floodlight in this sombre world.

More lead roles for her like.

Silva should be cut some slack.

(Ive certainly done worse after falling asleep and missing my stop on the last train.)

First the Captain called her unfit and then Glover called her deranged.

So far, shes anything but, having sniffed out most of a mystery under the most hostile conditions.

Its now imperative thatVigils traitor is uncovered (Captain Newsome?

CPO Doward, on whom the camera kept teasingly lingering?

), before the Russian asset enacts their scheme and everybody carks it.

Vigil continues on Sunday the 26thof September at 9pm on BBC One.