Dark Heart is a British television crime drama series, based on the Will Wagstaffe novels by writer Adam Creed, that first broadcast on 9 November 2016.

Jason Maza, Michele Austin, Alex Carter and Gregg Chillin joined the cast following the departures of Brooke and Holdbrook-Smith, who was unable to return to the series because of other filming commitments.

[7] The rebroadcasting of the pilot prompted an article in the Daily Express, detailing complaints from several viewers, who claimed that ITV's failure to bill the first two episodes as a repeat were "misleading".

[8] Those who were unaware that the first two episodes were a recut of the pilot noted a considerable unexplained change come episode three, with a number of new cast members (Jason Maza, Michele Austin, Alex Carter and Gregg Chillin) appearing without explanation, and the unexplained aging of Will's nephew Harry (Joseph Teague), who appears to be of primary school age in the pilot, but suddenly looks considerably older and is seen to be attending high school.

As DI Will Wagstaffe (Tom Riley) and his team investigate further, they learn Collins was arrested two and a half years ago on suspicion of sexual assault of his own daughters, Holly and Jasmine, who were just nine and eleven at the time.