DCS Ian St Clair is called to investigate a tragic and unexpected murder in an ex-mining town as news of the crime threatens to inflame historic tensions.

With two killers now on the run, Ian is forced to call in the Met to support the manhunt. Meanwhile, the hunt for the mystery spy cop intensifies as a link to Scott is found.

As the manhunt closes in on Scott and Andy’s location, the search for the spy cop turns the clock back to 1984 to reveal their identity and the events of that fateful night.