Who was Dr. Sadao?
Dr. Sadao Hoki was a prominent Japanese surgeon during World War II. He was highly skilled and well-respected in his field. Despite being Japanese, Dr. Sadao had received his medical education in America and had adopted some Western values and ideals, making him unique among his peers in Japan.

Will he be arrested on the charge of harbouring an enemy?
Dr. Sadao Hoki was not arrested for harboring an enemy, despite the fact that he did harbor one. This can be attributed to several reasons:

American Soldier's Arrival:
- Dr. Sadao Hoki found an injured American soldier, who had washed ashore near his house during a storm.
- Due to his medical training and his humanitarian instincts, Dr. Sadao could not ignore the soldier's plight and decided to save his life by operating on him.
- Dr. Sadao was torn between his loyalty to his country and his duty as a doctor to save lives.

The Dilemma:
- Dr. Sadao's dilemma became more complicated when he realized that the injured soldier was an enemy combatant, a prisoner of war.
- According to the laws of war, harboring an enemy could be seen as an act of treason.
- On the other hand, Dr. Sadao felt a moral duty to save the soldier's life, as it was the right thing to do.

Factors Preventing Arrest:
- Despite the potential consequences, Dr. Sadao's position as a highly skilled surgeon made him valuable to the Japanese government.
- Additionally, his reputation and connections within the medical community may have afforded him some level of protection.
- The fact that the soldier was severely injured and unable to escape further reduced the immediate threat he posed.

Conclusion:
In conclusion, Dr. Sadao Hoki was not arrested for harboring an enemy because of his professional value, reputation, connections, and the fact that the soldier was severely injured. The moral dilemma he faced, as well as his skills as a surgeon, played a significant role in his decision to save the soldier's life, despite the potential consequences. Ultimately, the circumstances surrounding the situation prevented his arrest, allowing him to continue his work and navigate the complexities of his actions during the war.