Mary Ward is returning home to the U.S. from Ruritania, where she has been courted by Count Dario. She stops over in Manila to find out that war has broken out in Ruritania, and that her mother and sister have been killed in an air raid. She comes back to the U.S. with Paul Strong, who has been appointed Minister of Energies. Mary meets up with the Count in New York, and uses him to infiltrate the enemy. With the help of his sister, Jane, Strong rallies America to fight. Meanwhile, Mary's brother, Philip, has been blinded in battle, while his fiancee, a nurse, has been disfigured. The Ruritanian army is headed by the Count's father, Prince Dario, and he captures Jane and has her shot. He also orders the Count to be shot for disobeying orders. But America prevails, and sends the invaders packing, while Mary and Strong end up in the usual romantic clinch.