Ruth has lived at Netherburn, her home in the remote moors of Scotland, ever since she was a small child. It's a home with a history, and, having seen her own children grow up and move on, Ruth is trying to make sense of it all. From her Father's death, to her ex-husband leaving and her lack of contact with her sons.

But she's not alone with her thoughts: her empty house has become lively once again as various people - with equally complicated pasts - come to lodge at Netherburn, and Ruth finds herself helping them through their pain; some of which won't stay in the past.

Forgive is the story of Ruth, and those living at Netherburn, as they live their lives and try to move on. But the question always looms for Ruth, what does it mean to forgive?