The second series switched things up, giving a more prominent role to DI Kirsten Longacre (Leslie) and focusing on a death related to drone warfare technology.

Now the third series will see the duo at a remote Arctic research station, where a member of a covert British special forces mission has been murdered.

The pair must solve the case while navigating rising international tensions over control of the Arctic and its resources.

A synopsis adds: “Amy and Kirsten will need to catch the killer and defuse a potential international confrontation, as different nations compete for control of the Arctic and its resources in the changing polar climate, with both their careers and relationship on the line.

“As the mission rapidly unfolds, Amy and Kirsten begin to question who they can trust.

Discussing where her character is at at the start of series three, Jones shared: “All of the Vigil series are about fighting for truth, coming up against the bigger picture and wanting the world to be a better place, so that really attracted me.

“Each series also brings new challenges with Amy not knowing her surroundings – she’s constantly put into these new worlds, with new rules and new characters and so she’s always trying to figure out where her authority is in that.

“I also think Amy and Kirsten are kept in the dark with what they’re being told and it’s their job to find the gaps and piece it together.”

Vigil series 3 full cast list

Suranne Jones as Amy Silva

Rose Leslie as Kirsten Longacre

Gary Lewis as Colin Robertson

Orla Russell as Poppy Silva

Dominic Mafham as Sir Ian Downing

Jeppe Beck Laursen as Henrick Becken

Naomi Yang as Shen Jia

Tornike Gogrichiani as Fyodor

Steven Miller as Mark Cunningham

Benjamin Wainwright as Oli Pickford

Danusia Samal as Jasmine Kelly

Eric Godon as Mayor Korotayev

Amy Manson as Lorna McCallister

Artur Zai Barrera as Garcia

Jordan Duvigneau as Simon Anderson

Kaisa Hammarlund as Deputy Olsdatter

Adam Fidusiewicz as Evgeni

Conor Berry as Daniel Hodge

Jason Tobin as Huang Chen

Steven Cree as Gordon Laity

Killian Coyle as Jason Collyer

Derek Riddell as Vincent Mair

Alma Prelec as Polina

Dawn Sievewright as Chloe Ackroyd

Shereen Cutkelvin as Holly Mitchell

Recommended reading:

When will Vigil series 3 be on TV?

The first episode of Vigil series three will air at 9pm on Sunday, August 30 on BBC One.

The second will follow the next day in the same timeslot on Monday, August 31.

After that, the remaining four episodes will air in the same pattern and will be available to watch on BBC iPlayer.

Will you be watching Vigil series 3? Let us know in the comments.