Scenes from Ruggero Leoncavallo's opera with Canio, the clown, introducing actors who are seen in pantomime while the operatic voices are heard off-screen. Canio discovers his wife has been unfaithful but carries on with his performance.

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.

A bored society woman invites scandal and heartache when she falls in love with her low-born chauffeur.