Grace (John Simm) and Bella (Laura Elphinstone) investigate a murder on a council estate, where Roy once worked as a beat copper, when a teenager named Chris Perkins is tragically stabbed to death. Signs initially point to this being drug-related, when a wrap of narcotics is found on the body, but Chris’s devastated parents are adamant that their son had nothing to do with drugs, and something isn’t quite adding up. As Grace delves into the underbelly of the estate, his investigation brings him face to face with someone from his past, which stirs up old demons, and Bella worries his personal connection may be clouding his judgement.
As Grace’s team recovers from the distressing events of the past few days, they are called to the scene of an awful car accident when a local hotelier, Bryson Lambert, is killed by an oncoming driver who cruelly flees the site of crash, leaving him to die. As Roy (John Simm) searches for the other driver involved, an unexpected discovery soon pulls his investigation in a shocking new direction and Grace now realises that Bryson’s death was just the tip of the iceberg, when he suddenly has a much bigger puzzle on his hands, which may prove to be one of his most complex cases yet. What Grace must uncover is a dark criminal underworld with a disturbing truth and a twisted perpetrator at the heart of it all. Roy’s team is on the trail, but with every discovery, a new layer to the mystery unfolds.