Two families. One deadly game. Aisling Connolly is sleeping with Lukasz Badowski and the Connollys can't have that. So when Seamus Connolly asks Locke to trail his youngest daughter, it's easy money, his bread and butter. But the families don't see it that way. Blood is blood. Then a high profile copper is found butchered in the river. A long standing feud is re-ignited. And Locke wants out…