With Morgan missing, Caryn makes a police statement to Gina. Gina finds the killer's address, but he's moved on to a new target: Jeff.

The police mount an unusual operation in an attempt to catch the killer but the operation fails when Harri interferes. Richie is attacked at the police station and the identity of the killer is revealed. Sam attempts to help Caryn and is required to stand up to Morgan once and for all.

Wynn Edwards is located and new evidence brings a surprising revelation. Following a fourth death, the police act to protect Richie and Duncan, but Duncan takes a risk that has a deadly conclusion. Sam finds work and starts to realise all is not well in Caryns world.

The killer targets his third victim and the killing has a seismic impact on Sam and Ginas world. The police step up their efforts to protect the accused men and start to monitor their mobile phones. The killers identity is revealed.

The discovery of a second body leads police to believe they are searching for a serial killer. Connections are made between the murder victims and a historic rape investigation. Sam starts to find his feet but struggles when his mother reaches out to him.

A murder investigation is launched when a body is discovered hanging upside down in an abandoned horse box on Aberavon beach. Detective Sergeant Gina Jenkins sets out to find the killer, but the case coincides with her brothers long anticipated release from prison.