Rhythm of a Runner appears to be a book about running, but the reader is soon captivated by the miraculous story about the life of a courageous child who overcomes his belief that he will die young from congenital heart disease, and instead becomes a successful endurance athlete and surgeon. It is as if the reader joins him on a trail run through life and is a witness to the extreme pressures, glory, and sadness experienced during the rigors of surgical training. With detail and emotion Denys shows how running provides a means to find comfort and express gratefulness for a second chance at life after recovering from heart surgery, a life threatening illness, and the chronic life-long reminder of his mortality caused by the beating of his erratic heart. The story brings the reader into the medical school anatomy lab, the operating room, the bedside of a child dying from cancer, the chaotic water of an Ironman Triathlon, the start line and the lonely trails of some of the most grueling endurance races in the world, and the exotic landscape of Kenya, home to elite runners and human tragedy.