Rival logging companies battle for the Valley of the Giants (redwood trees) when a young engineer returns home to help his father by building a new rail line to transport the logs to the sawmill. A romance between the engineer and the rival's niece complicates the situations.

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.

M'liss, a feisty young girl in a mining camp, falls for Charles Gray, the school teacher. Charles is implicated in a murder of which he is innocent, and the two must fight to save him from a lynching.

American law clerks Anthony Hamilton Hawthorne and Rodney Blake are nearly broke in Monte Carlo when Hawthorne breaks the bank. While driving through the impoverished kingdom of Bovinia, Hawthorne falls in love with a woman he meets when he retrieves his blown-off cap. Deciding to stay, Hawthorne is persuaded to finance a revolution until he learns that the woman he loves is Princess Irma and that she is in danger of being assassinated.