Define the theme of the story …

The Enemy is a story set in Japan during the second world war. In this story, an injured American army man washes up on the beach near the home of a Japanese surgeon, Dr. Sadao Hoki. Although he has lived in America and follows a modern profession, Dr Sadao’s family lives a traditional Japanese life.
Dr Sadao is in a dilemma to leave the American man to die, to throw him back into the sea, to hand him over to the army or to save his life. He reluctantly takes him home and decides to save his life. The presence of an enemy disrupts his family life. His wife is against his idea of operating upon and taking care of the soldier. The servants of the house oppose the idea and leave their master. Yet, Dr Sadao shelters him, operates upon him, and saves his life.
Out of the fear of being accused of sheltering an enemy, he narrates the incident to a general in the Japanese military. The general helps Dr Sadao and offers to get the man killed by hired killers. However, the killing doesn't take place, and after waiting for three nights, Dr. Sadao thinks of getting rid of the American himself. He arranges a boat for the man to help him reach the nearby island. He provides him necessities like food and clothing to survive till he finds a Korean fishing boat which could rescue him. Dr. Sadao wonders that why did he save the life of an enemy.