Gemma Whelan launches new crime drama The Tower at ITV tonight, a gripping tale of a police call out that goes horribly wrong.
But what was the novel it was based on and who joins Game of Thrones star Whelan in the cast?
Here's all you need to know about The Tower.
When is The Tower on TV?
The new three-part series begins tonight on Monday, 8 November at 9pm on ITV.
It continues over the week on Tuesday and Wednesday nights at 9pm, and will also be available to watch on ITV Hub.
What is The Tower about?
Crime fiction fans may already be familiar with the story under the name Post Mortem, a novel written by former Met detective Kate London.
Her work is full of detail from her police career, so expect an incredibly accurate portrayal of detective work.
The Tower starts with a shocking scene at a call out to a tower block which ends in tragedy when one officer and a young woman fall to their deaths, while the other officer and a five-year-old child are still alive on the roof.
But when the surviving officer Lizzie Adama goes missing, things take an even more complex turn as DS Sarah Collins must find her colleague and work out what happened on the roof.
The drama takes in themes of racism in the police force as the investigation uncovers relationships and tensions between officers.
Read more: What to watch on TV this autumn
Whelan, talking about how the drama looks at the consequences of the way people speak to each other, said: "What I love about this script is that they are what you could call very small pieces of unacceptable behaviour that would several years ago maybe have been brushed off as just that.
"We cannot escape the fact that this is not acceptable anymore, however casual, however well meant, whatever angle you think you are coming from. I think it’s really interesting and believable."
Who stars in it?
Gemma Whelan, best known for her role in Game of Thrones, stars as DS Sarah Collins.
She's joined in her investigation by DC Steve Bradshaw, played by Jimmy Akingbola (Kate & Koji).
Tahirah Sharif (The Haunting of Bly Manor) plays missing PC Lizzie Adama, and the cast also includes Emmett J. Scanlan (The Fall, Hollyoaks) as DS Collins' infuriating colleague DI Kieran Shaw.
Watch: Gemma Whelan says Game of Thrones sex scenes were 'a frenzied mess'