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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.

Carl begins to interrogate Stevie's family and friends in a bid to shed some light on his murder. Gina follows up on the reports of gunshots on Sam's estate and begins to suspect Rhys and Mel's involvement, unaware that Sam is struggling under the pressure of keeping his secret to himself. A loanshark with connections to Stevie is badly beaten by a gang of thugs. Layla is surprised when Patricia unexpectedly offers a reward for information relating to her husband's murder. Sam is devastated when his Nan's failing health finally gets the better of her.

Gina finally makes to make her way onto the investigation team, but the discovery of a second body poses the team more questions than answers. When Sam's employers get wind that someone has been stealing from the warehouse, a thorough search is conducted, and Sam fears he is to be found out – but when co-worker Cai is found to have a stolen child's toy in his locker, he is assumed to be the thief and is fired on the spot. Cai pressures Sam into compensating him for losing his job, and the pair decide to rob one of the company's vans full of expensive electrical equipment.