Exploring Unseen Worlds is a critically sophisticated, yet gripping immersion into the inner worlds of one of America's foremost thinkers. It demonstrates convincingly the extent to which James's psychological and philosophical perspectives continue to be a rich resource for those specifically interested in the study of mysticism. The book focuses on James's enduring fascination with mysticism and not only unearths James's lesser-known works on mysticism, but also probes into the tacit mystical dimensions of James's personal life and uncovers the mystical implications of his decades long interest in psychical research.