Procedural crime series set in the world of the City of London police force, who are responsible for policing London's Square Mile. Based on a series of best selling novels. DI Will Wagstaffe is a man haunted by his past in this drama written by acclaimed writer Chris Lang and based on the novel Suffer the Children by Adam Creed. Wagstaffe, known as Staffe, is at London City airport when his colleague, DC Josie Chancellor, calls him to tell him there's been a gruesome murder. Being the workaholic he is, Staffe abandons his personal plans and heads to the scene of the crime. Together with the team they go on to investigate the murder, uncovering much more than they ever thought they would. Dark Heart is an ITV Studios production for ITV Encore.