ITV says it has ordered a second season of "Dark Heart," its London cop drama written by Chris Lang and starring Tom Riley.

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Filming on the six new episodes is scheduled to begin in early spring.

The show is inspired by characters created by novelist Adam Creed, who has written a series of books featuring Riley's character Will Wagstaffe, a lawman haunted by the unresolved murder of his parents when he was a teen. 

"We're thrilled Tom Riley has agreed to return as Will Wagstaffe in 'Dark Heart,'" Polly Hill, the network's head of drama, said in a statement.

"As the central character, he has immersed himself in police work to seek some form of closure for what has happened in his past. It's a gritty, emotionally driven thriller from Chris Lang, which I'm only too pleased to re-commission from Kate Bartlett's new drama label."