Since the start of its operations 10 years ago, the International Criminal Court has dealt with a number of challenges to the admissibility of cases before it. Some of the challenges were mounted by territorial states that had jurisdiction over the cases. Others were mounted by accused persons. The Court, acting on its own initiative, has, on a number of occasions, also considered issues of the admissibility of cases before it. It has done this, in the main, at the pre-trial stages of proceedings. Some of the cases arose out of state or Security Council referrals. Others arose out of the Prosecutor's initiated investigations. In the course of dealing with these matters the Court has endeavoured to strike a balance between the states’ right to exercise their sovereignty through national proceedings, on the one hand, and the interests of the international community to ensure that ‘the most serious crimes of concern to the international community as a whole must not go unpunished’, on the other. In the process of doing so the Court has also developed some practices and generated an impressive body of jurisprudence, the subject of this article. The jurisprudence evinces the Court's readiness to assume jurisdiction over a case in situations where there is clear inaction on the part of the national authorities. The article, which is a critical exposé of that jurisprudence, endorses this stance as a veritable antidote to impunity for atrocity crimes.