Book review: Unity in Adversity. EU Citizenship, Social Justice and the Cautionary Tale of the UK, by Charlotte O’Brien. (Oxford: Hart Publishing, 2017) - Common Market Law Review View Book review: Unity in Adversity. EU Citizenship, Social Justice and the Cautionary Tale of the UK, by Charlotte O’Brien. (Oxford: Hart Publishing, 2017) by - Common Market Law Review Book review: Unity in Adversity. EU Citizenship, Social Justice and the Cautionary Tale of the UK, by Charlotte O’Brien. (Oxford: Hart Publishing, 2017) 55 6 Common Market Law Review