The implications of Brexit for Northern Ireland are profound, given its history and geographical position as a land border with the European Union. Mary Murphy offers a detailed and in-depth analysis of Northern Ireland’s relationship with the EU, the role the EU has played in rebuilding the region after the Troubles, and the challenges and opportunities that Brexit might offer Northern Ireland both in terms of its fragile politics and economy. Northern Ireland has long occupied a greater political space than might seem warranted, given its size and relatively underdeveloped economy. This space may yet again become the most hotly contested and divisive topic in future Brexit negotiations, if it doesn’t in fact prove to be the key to a successful UK withdrawal and future relations with our European neighbours.