A naive young woman's strong anti-war sentiments get her into trouble in this silent cautionary tale. She is such a devout pacifist that she spurns her lover when she learns that he has invented an aerial torpedo. Instead, she gets involved with a foreigner who swears that he totally shares her beliefs. Unfortunately, he is a foreign spy in disguise. At his urging, the innocent girl steals her ex-beau's plans and delivers them to the spy. When she learns that he is the enemy, she fights him and with a sword kills him. It is still not enough to stop the enemy from attacking an American port city.