Grace and Bella investigate a murder on a council estate,where Roy once worked as a beat copper, when a teenager namedChris Perkins is tragically stabbed to death. Signs initiallypoint to this being drug-related, when a wrap of narcotics isfound on the body, but Chris's devastated parents areadamant that their son had nothing to do with drugs, andsomething isn't quite adding up.As Grace delves into theunderbelly of the estate, his investigation brings him face toface with someone from his past, which stirs up old demons,and Bella worries his personal connection may be clouding hisjudgement.