A murder investigation is launched in the steel town of Port Talbot when the dead body of local businessman Stevie Rose is discovered in the town's marina. Ambitious policewoman Gina spies an opportunity to win promotion by helping to track down Stevie's murderer. Unbeknown to Gina, her brother Sam is befriended by a new neighbour with a favour to ask and he finds himself in possession of a gun.

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