Anna Pratt takes a close look at the laws, policies, and practices of detention and deportation in Canada since the Second World War. She demonstrates that although the desire to fortify the border against risky outsiders has long been prominent in Canadian immigration penality, the degree to which concerns about security, crime, and fraud have come to govern the process is unprecedented. Securing Borders traces the connections between seemingly disparate concerns – detention, deportation, liberalism, law, discretion, welfare, criminal justice, refugees, security, and risk – to consider them in relation to the changing modes of Canadian governance.