The King of Romania and his daughter visit Washington. Communist extremists oppose the king, and they threaten to assassinate the princess. The SecNav appoints Harm to escort her. The antagonists try but fail. Harriet shows up in DC.

Two Marines sustain injuries during a training exercise. Mac and Bud investigate whether the company commander has placed his men at undue risk. Harm goes undercover. A third Marine becomes injured. The captain confesses.