Jack Hulbert is descended from a long line his father told his mother about being descended from naval heroes. Jack, however, failed school, and became an Able Seaman; he meets admiral's daughter Nancy O'Neil and gets involved in rescuing her, her father, and a submarine that has been stolen by Chinese pirates.
Jack was a popular musical comedy star for British Gaumont, and in this one, he sings and dances in one and a half numbers before the movie gets turned over to the comedy direction of Walter Forde. Forde had begun on the stage as a comic, moved into short comedy production and behind the camera in the late 1920s. He excelled in comedies in which the hero bumbled his way to victory, and this is one of them. Although the now old-fashioned comedy tropes of the British film industry have not aged well for this modern American, they were certainly popular in their day and Hulbert starred in a fair number of comedies in which he lampooned the branches of the armed services and even Bulldog Drummond.