Jorge Luis Borges was profoundly interested in the ill-defined and shape-shifting traditions of mysticism. However, previous studies of Borges have not focused on the writer's close interest in mysticism and mystical texts, especially in the Swedish mystic Emanuel Swedenborg (1688-1772). This book examines the relationship between Borges' own recorded mystical experiences and his appraisal of Swedenborg and other mystics. It asks the essential question of whether Borges was a mystic by analysing his writings, including short stories, essays, poems and interviews, alongside scholarly writings on mysticism by figures such as William James. The book locates Borges within the scholarship of mysticism by evaluating his many assertions and suggestions as to what is or is not a mystic and, in so doing, analyses the influence of James and Ralph Waldo Emerson on Borges' reading of Swedenborg and mysticism. The author argues further that Swedenborg constitutes a far richer presence in Borges' work than scholarship has hitherto acknowledged, and assesses the presence of Swedenborg in Borges' aesthetics, ethics and poetics.