• E1
• 0 hrs 58 min
• 29th August 2021

When a crew member is found dead aboard the Trident nuclear submarine HMS Vigil, Detective Amy Silva is flown out to investigate.

• E2
• 0 hrs 58 min
• 30th August 2021

With Vigil in danger, Amy must fight to continue her investigation. Meanwhile, Kirsten’s enquiries lead to tragedy.

• E3
• 0 hrs 58 min
• 5th September 2021

Kirsten’s investigation takes her into the heart of Scottish politics, but when she unearths a navy cover-up, it leaves Amy questioning who she can trust on Vigil.

• E4
• 0 hrs 58 min
• 12th September 2021

Kirsten closes in on the killer, but their capture reveals the grave threat that Vigil faces. On the submarine, Amy makes a terrifying discovery.

• E5
• 0 hrs 58 min
• 19th September 2021

Vigil is forced into lockdown as disaster strikes. With communication lost, Kirsten desperately hunts for clues to the source of the threat to Vigil.