Lawrence Hill-Cawthorne’s 2016 OUP monograph, Detention in Non-International Armed Conflict, has just been released in paperback with a new preface discussing recent practice and case law on the topic. The book remains the only comprehensive examination of the international legal regulation of detention in non-international armed conflict. It has had a significant impact on academia and policy. It has received the two most prestigious international academic awards in the field: the 2016 Francis Lieber Prize by the American Society of International Law and the 11th Paul Reuter Prize by the International Committee of the Red Cross. It has also been cited and relied upon by the UK Supreme Court.