Ezequiel Heffes’ monograph entitled Detention by Non-State Armed
Groups under International Law comes at the right time, and with its
approach of merging a doctrinal legal analysis with case studies from the
field, it fills an important gap in the literature. This book should be
warmly welcomed by both academics and practitioners. We owe him
gratitude for his thorough research and persuasive legal analysis, which
pushes the frontiers of international law and opens new horizons.