Public inquiries into matters of conflict and security are vitally important yet undertheorised. This article explores the potential of inquiries for the democratic scrutiny of foreign policy, military doctrine, and grand strategy. In recent decades, there have been numerous inquiries into contentious foreign and security policy incidents in Britain, a trend reflected elsewhere in global politics. Inquiries can unveil facts, identify lessons, and rebuild trust. But critics claim that inquiries overlook systemic flaws. Our analysis transcends the usual arguments for or against public inquiries by explaining how inquiries produce knowledge and how this could be improved. We argue that inquiries necessarily involve the following three distinct processes: scandalisation, archivisation, and epistemology. We suggest how future inquiries could overcome extant limitations through a broader scope, diversification of evidence, and methodological pluralism. Such inquiries can play an improved role in promoting reflection and dialogue about a just international order and Britain’s role within it.