This book embarks on a comprehensive exploration of the jurisdiction of the International Criminal Court (ICC) and elucidates the three foundational aspects of its jurisdiction as laid out in the Rome Statute: the preconditions for exercising jurisdiction (Article 12 ICCRSt), its substantive competence regarding core crimes (Articles 5-8bis ICCRSt), and the principle of complementarity (Article 17
1(a) ICCRSt).

This principle, crucial to understanding the ICC's 'ultimate jurisdiction', is invoked only when a State Party demonstrates an inability or unwillingness to genuinely...