Sellner provides an overview of the Celtic Christian world and Soul Friends in particular. Even though the title is "The Celtic Soul Friend," the topic of soul friends only recieves focused in attention in the last chapter. The rest of the book is primarily an introduction to Celtic Spirituality from Sellner's point of view. Sellner's approach is between academic and devotional but he leans toward the devotional. Thus the book avoids addressing many of the critical arguments surrounding the historicity of Celtic Spirituality. In spite of the sparse treatment of soul friends, the book still has merit, presenting a vision of soul friends that is beyond simply glorified mentors to a dynamic of relationship that flows in both directions.