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DI Cadi John investigates the death of a young woman found in a river, who appears to have been shackled for some time before her demise; Cadi and her colleague DS Owen Vaughan identify the body as Mali Pryce.

Admonished by his domineering mother, Iona, Dylan skips work and develops an unhealthy obsession with Lowri, a young nurse; the detectives interview Malis friend Sara, who points them to Malis dangerous ex-boyfriend.

Cadi argues with her sister about their ailing father; Lowri recounts the details of her attack to the police, leading them to question her abusive ex-boyfriend, Marc.

As Harry and Gina get closer to putting the pieces of the puzzle together; Harry must decide whether he is prepared to put everything on the line.

While dealing with her father's failing health, Cadi attempts to track down Dylan's truck; with Megan still locked up, Dylan's neighbor makes an unexpected visit, and Lowri struggles to recover from her attack.

Dylan releases Megan from her shackles but threatens to chain her again if she tries to run away; Cadi questions a man in prison who was convicted for the murder of another young girl, a crime that Cadi believes may be linked to Mali's death.