Although the doctrine of the Trinity is a core Christian belief it remains contested in terms of how it is conceptualised and expressed. This essential Guide for the Perplexed expounds different conceptual models and the technical language used to express these models. It examines attempts to apply the doctrine in the twentieth and twenty-first centuries, e.g. in relation to ecumenical dialogue, with its main approach focusing on hermeneutics and ontology of relationality. Providing a complete overview, as well as new insights into the area, Trinity: A Guide for the Perplexed is an essential read for students of Christian Theology.