Our intention for this second edition is the same as it was for the first: to provide an accessible yet challenging explanation and appraisal of international criminal law and procedure for students, academics and practitioners. We focus on the crimes which are within the jurisdiction of international courts or tribunals – genocide, crimes against humanity, war crimes and aggression – and the means of prosecuting them. We also briefly discuss terrorist offences, torture, and other crimes which are not (yet) within the jurisdiction of an international court or tribunal.