A doctor transplants the brain of a girl who is in love with him into a girl he is in love with.

During World War I, the beautiful and patriotic Leslie Selden is courted by two ardent admirers: Jack Wynn, a young man not yet taken by the draft, and Dr. Wolff, a Danish scientist who, in reality, is a German agent. When Jack learns that Wolff is masterminding a plot to bomb several munitions factories and destroy the water system in New York City, he goes to the spy's home and confronts him.

Through the Wall is a silent 1916 film

Mary Conway was a nonentity in Mrs. Scott's New York genteel boarding house. She had never had a beau. Andy Donovan, a new boarder, caused her first flutter and regret for her unattractiveness. A description in a lurid novel of the grief-stricken heroine and the attention she attracted in her garb of woe gives Mary an idea and - two weeks later she appears fashionably attired in Fifth avenue mourning - and weeps forth a tale to the now sympathetic Andy of a dead fiancé, the Count Mazzini.

Hal Page, the weakling brother of Stephen Page, the town mayor, falls in love with Carline Shrefton, who throws over Burt Staley to entangle Hal in her self-serving schemes. Furious over her abrupt departure, Staley shows up at Carline's, and a jealous fight with Hal ensues in which Staley is shot and killed with Carline's gun. After Hal confesses to the deed, Stephen quietly sends him off to Spain. One year later, Stephen announces his engagement to Marion Hayward, the daughter of the district attorney, who is pressing charges against James Reed, a corrupt politician and Carline's new husband. To save Reed, Carline threatens Stephen with exposure, but he refuses to bend to her demands. Just days before Carline is to reveal her story about Staley, Hal appears and confesses to Hayward that Carline is the true killer.

Leonard Sheldon is the manager of a Mexican vineyard which is suffering from a diphtheria epidemic. Sheldon calls for a doctor and gets Katherine, much to the chagrin of the Mexicans. They've never seen a woman doctor, and their peasant superstitions lead them to believe that her forehead-mirror is "the evil eye," and that it's making their children die even faster.

The Mystery of Lake Lethe is a 1917 silent film