Emma Banville sets out to prove the innocence of Kevin Russell, a man who was convicted for the murder of schoolgirl Linda Simms 14 years earlier. Firmly believing there has been a miscarriage of justice, Emma is prepared to go to extreme lengths to discover the truth and free Kevin.

Released from prison, Kevin faces abuse from the public as Emma takes drastic measures to get the case back on track. Miriam makes a call which has devastating consequences for Emma.

As Kevin's retrial begins, the pressure mounts on Heather to get Kevin back in jail and wrap up the case. Emma has a breakthrough with new evidence, but powers outside of her control seem set to crush her attempts to prove Kevin's innocence.