Kate Lennox is bored with suburban life and her husband, Harry. Their next-door neighbors, the hen-pecked Henry Fells and his wife, Maud, have several boarders, among them Barbara Farley, who is Lennox's stenographer, and Lonnie Whinston, who is in love with Lennox's little sister, Ruth. Kate claims that women need more independence and less duty, and flirts with Ned Hollister, a car salesman.

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.

Gervas Carew's wife, Elinor, has deserted him while he was fighting for France, for Lord Clyde Geraldine, a cad of the first order, but Elinor, in turn is cast off when Lord Geraldine turns his attention to an Irish lass, Marny. Marny has no idea of Geraldine's past nor his brutal nature.

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.