Ayer gets inside the rowing world in a way that hasn't been done before, putting the reader in the passenger seat next to one of the most successful coaches of all time. Parker was the first US National Team coach, and oversaw five Olympic teams. He coached the sons of great oarsmen, and at age 70 was still putting the sons to shame on a bicycle, or running the steps of the Harvard Stadium. Intertwined with the narrative's historical perspective are profiles of other coaches at Harvard, and impressions from rowers and coaches who worked with Parker over the previous forty-five years.
The Sphinx of the Charles is a chronicle of a year with the Harvard team and a profile of Harry Parker as he was, five years before his death: comfortable in his position as elder and master of the sport, reflective but not nostalgic, aged but nearly impervious to aging.