LINE of Duty star Anna Maxwell-Martin has signed up to appear in a gritty new ITV true crime series.

The BAFTA-winning actress will take on the lead role of Delia Balmer in the self-titled series.

The show will follow the story of Delia in London in 1991 where she meets free-spirit John Sweeney, played by Endeavour star Shaun Evans.

At what first appears to be a healthy romantic connection between the two soon turns into something way more sinister.

Wicked John violently attacks Delia and tells her stories of how he killed his ex and disposed of her body in the Amsterdam canal, as she quickly realises he is nothing like the man she first thought.

The series will follow how an incredible error sees John released on bail after being arrested for his crimes when the courts fail to see just how dangerous he is.

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He quickly pursues Delia and subjects her to a near-fatal attack.

Over the show, Delia attempts to rebuild her life when John disappears but to her horror comes face-to-face with him again after seven years.

Speaking of joining the show, Anna said: "Telling an important story with the excellent team from World Productions, producer Ken Horn, director Julia Ford and a brilliant cast is always an exciting proposition!

"As it is brought to life by Nick Stevens, hopefully we will do Delia due diligence.”

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The show has been developed based on Delia Balmer’s book, Living with a Serial Killer.

Filming on the grisly new series is set to commence this month and comes from the makes of blockbuster hits The Bodyguard, Anne and Line of Duty.

Delia Balmer is expected to air later this year on ITV1 and ITVX.

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