Following Brexit, the United Kingdom's border with Ireland has also become its frontier with the European Union. Historically, this invisible line has hosted smugglers and kings, runaways and terrorists, with implications for the way we look at nationhood, land, and power. To properly explore this landscape, Garrett Carr traveled Ireland's border on foot and by canoe. From encounters with border dwellers to uncovering hidden pathways and ancient monuments, Carr presents the borderland as a unique realm of its own, and asks what it portends for the future.