It's Valentine's Day, and a dispute between rival gangs leaves a teenage girl dead. Detective Inspector Charlie Resnick, nearing retirement, is hauled back to the front line to help deal with the fallout. But when the dead girl's father seeks to lay the blame on Resnick's partner, DI Lynn Kellogg, Resnick finds the line between the personal and the professional dangerously blurred. Meanwhile, the Serious and Organised Crime Agency starts to show a...