"The Spirit's Knock" presents stories from Clayton Forrester's life as he awakens to embrace the call to become a shaman. His journey takes him from Ohio to Texas, Switzerland, and Central Mexico. It is a story of possibilities, of death and rebirth, and of the evolution of consciousness. Through a series of life-changing experiences, including challenges growing up, a major health crisis leading to a near-death encounter, divorce, lucid dreams, out-of-the-body experiences, and visions, Clayton Forrester enters the shamanic world. From these experiences he comes to understand the power of inner silence and the heart to engage the capacities for perception waiting to awaken within himself. His experiences also show him that every single human being who is willing to accept the challenge to evolve might also develop these hidden capacities for perception. In accepting the call to become a shaman, Clayton Forrester develops an intimate relationship with the earth. Through this relationship he learns important lessons about his own journey and about humanity's journey to survive and evolve as a species. Along the way, he discovers a companion that will never leave his side.