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.
Knowing he could be the next victim, Jeff’s son, Richie, offers to let the police use him as bait to draw out the murderer. Sam discovers something shocking about Caryn.
After his argument with Gina, Sam stays with his mother but still gets caught up in the feud between his caseworker, Caryn, and her husband, DI Morgan Riley-Gina’s boss.
Dai is rattled when his bike shop is broken into, but he won’t tell Sam what’s wrong. Gina and Luke investigate reports of a gunshot heard near one of Jeff’s businesses.
Loner Sam's life is transformed when he comes into possession of a gun and starts to break the law. His ambitious policewoman sister Gina is paid to uphold it and makes it her mission to find the owner of the weapon. The family saga plays out against an inquiry into the shooting of a local businessman that raises questions for Sam and Gina about their father's murder when they were young children.