Police officer DI Liz Nyles works in the secretive world of Witness Protection. When we meet her, she's juggling a high-stakes job alongside a demanding family life - attending to the needs of a teenage daughter, a difficult ex, and a dad recovering from a stroke.

Liz offers crucial information to DCI Wheatley but doesn't reveal certain facts, worried she will compromise both herself and her secret investigation into the leak.

Liz secretly seeks out the second witness against gangster Crowther. She is determined to connect Crowther to the shocking events - but at the same time she fears that her lover, Brandice, is also connected to the gangster.

As Liz fights to prove foul play, she finds herself sabotaged and the danger gets frighteningly close to home.

A life hangs in the balance, and Liz feels the blame directed firmly at her. Whilst still not trusting other members of the police, she decides to take matters into her own hands, with surprising consequences.

Isolated and with nothing to lose, Liz goes even further on her path of transgression in her desperate pursuit of the truth. But can she uncover the conspiracy before corrupt forces stop her?