It is 1963 and in north Wales the Jones family are being forcibly ejected from the land they have farmed for generations. Their valley is to be drowned, turned into a reservoir for the people of Liverpool. While her husband Dai is grief-stricken, Olwen Jones privately sees it as a blessing, an unforeseen chance to escape the narrow confines of the valley. But for her teenage son Emyr, Liverpool's careless arrogance is proof that Wales will never be free to decide its own future until, like Ireland, it breaks the shackles of English imperialism. Based on true events, Adder Stone is an exploration of personal identity and the possibilities and limits of love. How far will we go for our child or for our country? Who are we when we lose the places and the people that define us? And how much, in the end, is it possible to forgive?