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.

While staying at a hotel Sam and Ela take advantage of another guest with heartbreaking consequences for Sam. Gina searches for more information about her father's death.

Gina starts to suspect Sam and the truth comes out about the gun. Gina is forced to make a difficult decision and a meeting with Douglas Rose floors her

Gina is horrified to learn Sam is in danger. The truth about Stevie Rose's murder is revealed. Gina discovers something in Ray and Linda's house that leads Sam to remember what exactly happened to his father.

When Gina discovers a body on the beach, the victim’s boyfriend accuses a local businessman. Gina is distracted from the investigation by Sam’s return home from prison.