This work investigates the concept of the "fire in the head" as a descriptor for visionary and shamanic experience within the context of Celtic traditions. Thomas Dale Cowan, an author known for his work on shamanism, draws upon ancient Celtic myths, tales, and the writings of poets like William Butler Yeats to explore the nature of shamanic consciousness. The book outlines techniques for accessing the shaman's world, presenting a cross-cultural examination of shamanism through the lens of the Celtic imagination.

This book is recognized as an intelligent and well-informed exploration of Celtic shamanism, offering valuable insights for Westerners interested in the subject. It is praised for its lyrical approach and its ability to connect ancient traditions with contemporary spiritual seeking. The work is considered an important contribution to the understanding of shamanic practices and their roots in Celtic culture.