Cosmo Paradyne, a successful and overworked King's Counsel living a monotonous life in Ealing with his cold wife Martha, finds his orderly existence shattered by a wandering minstrel playing a magical silver flageolet. After winning the instrument in a strange musical contest, Paradyne undergoes a profound psychological shift that erases his conventional identity and leads him to abandon his legal practice. He wakes up weeks later in France, owning a gipsy caravan and a horse, living as an unlettered hawker on the sunlit plains of La Beauce. Without any memory of how he made the transition, he discovers an intense physical vitality and an emotional capacity for beauty that contrasts sharply with his former existence as a legal automaton.
As he travels toward Chartres, encountering rustic peasants and experiencing the magnificent cathedral with overwhelming wonder, he receives telegrams from Martha revealing that she has covered up his disappearance to avoid public scandal. Though she expects him to return to his dreary routine, Paradyne realizes that his old self was metaphorically dead all along. Rejecting the prospect of returning to a life of soul-killing drudgery and emotional sterility, he chooses to continue his journey southward into an irrevocable future of freedom.