In coming scenes, viewers will see Will and Cain interrogated by the police as they reveal new evidence has come to light.
Knowing he could be in trouble if the police find the weapon, Will asks Moira Barton (Natalie J Robb) where the gun has been hidden.
He goes on to reveal the gun was owned by the gang he used to work for, which was exposed by Harriet when she was a police officer.
But now links to the gang return to the village and Will is worried he could lose Harriet all over again.
