Dr. Sadao Hoki is a highly skilled Japanese surgeon living during World War II. One day, he discovers an injured American prisoner of war washed ashore near his home. Despite the tensions of war, Dr. Sadao decides to secretly treat and shelter the wounded soldier, putting himself and his family at risk by aiding the enemy. The story explores themes of morality, compassion, and the conflict between loyalty to one's country versus upholding personal ethics.