This article seeks to grasp the legal category of international child abduction through the conceptual lens of trust, from the standpoint of judges. In a more ambitious way, we delve into the relationship between law and trust in the context of the transnationalisation of family law. Going beyond the legal principle of mutual trust, we propose a solid conceptualisation of the notion of trust drawn from sociological theory and we analyse the issues that arises for judges both at the institutional and interactional levels. At the institutional level, we show how trust operates as a procedural mechanism that allows cooperation in the absence of explicit moral consensus, whilst at the interactional level, we demonstrate that trust is imbued with ethical value and pushes judges to be more open to foreign laws and culture.