DS Sarah Collins and her colleague, DC Steve Bradshaw, investigate the deaths of long-serving police officer, PC Hadley Matthews, and a 15-year-old Libyan refugee, Farah Mehenni.

With Lizzie still on the run, Sarah finally persuades her boss, DCI Tim Bailie, to go public about Lizzie's disappearance.

Lizzie decides to turn herself in, but first she meets Kieran Shaw in secret, who tries to persuade her not to implicate herself.

Sarah investigates a cold case; Lizzie responds to a domestic violence call.