The book "Tunnel: Pilgrimage, Volume 4" by Dorothy M. Richardson is the final part of a well-known cycle of novels about life and spiritual development in the depths of human consciousness. In this part, the main character, Margaret, sets out on a pilgrimage to find truth and inner peace through the exploration of her own soul. The novel offers the reader a sense of deep thoughtfulness, wisdom and inner knowledge, unfolding before him a story woven from capacity and interesting turns of events. "Tunnel: Pilgrimage, Volume 4" is a book that will leave an indescribable impression on the reader's heart and inspire the search for deeper meanings in one's own life.