A spoiled rich young woman overspends from her parents' savings and ruthlessly vamps on young men that she calls up randomly on the telephone. When her fiancée and his friends get word of this, they hatch a plan to teach her a valuable lesson.

In the office of Major Northfield, the quartermaster of the Pacific Coast, a leak has been discovered which may endanger the safety of American transports that are secretly carrying troops across the Pacific. Nara-Nara, a Japanese detective, is assigned to the case because his country has guaranteed safety to these transport ships. Nara-Nara believes that Northfield is guilty, although in reality it is Northfield's secretary Kitty Little, a girl of German ancestry, who is passing information to Dr. Ebell Smith, a German agent. Nara-Nara falls in love with Kitty, but soon after discovers that she is the leak in the quartermaster's office.

College football player Jack Hamill finds his reputation on the line when he pays an innocent visit to a woman whose husband kills himself.

Learning his Japanese mother committed suicide after being abandoned by his American father, the young Yukio journeys to the United States to have his revenge. However, his plans are complicated when he inadvertently ends up working for a network of spies who want to get their hands on some important documents possessed by none other than Yukio's long-lost father.