Detective Chief Superintendent Ian St Clair is dispatched to a former mining town following a devastating and unforeseen murder, the news of which threatens to reignite long-held community divisions.

With the search for the perpetrator ongoing, Kevin Salisbury of the Metropolitan Police arrives to lend his expertise. A palpable unease settles over the community as the killer’s cruel game intensifies.

The call to a second murder interrupts the somber proceedings at Gary's memorial. As Ian and Kevin arrive at the scene, whispers circulate about a former intelligence operative present at the service. Elsewhere, Scott continues to evade cap…

The escape of two killers compels Ian to request assistance from the Metropolitan Police, bolstering the search. Simultaneously, the pursuit of the enigmatic undercover officer gains momentum with the discovery of a connection to Scott.

With Scott and Andy's location now within reach, the investigation into the rogue officer retraces steps to 1984, illuminating their true identities and the events of that pivotal night.

Driven by a fierce need to safeguard those connected to the case, Ian is resolved now as never before to locate the rogue officer. The community struggles toward healing in the aftermath of their shared sorrow.