The boys get jobs as a butler and maid-- Stan in drag-- for a dinner party. When that ends in disaster, they resort to sweeping streets and accidentally capture a bank robber. The grateful bank president sends them to Oxford, at their request, and higher-education hijinks ensue.
Captain Drummond and his girlfriend want to marry but a hidden treasure in the house in which they want to celebrate their marriage is complicating the situation involving a series of deaths and an elusive murderer.
The invention of a machine that can cause remote explosions brings the attention of Scotland Yard and Bulldog Drummond.
Drummond has to leave for Morocco on his wedding day with his fiancee and trusted friends to rescue his friend Nielsen who is kidnapped by an international criminal.
Captain Drummond is travelling to Switzerland to marry his girlfriend. However, when a cargo containing dangerous explosives goes missing from its place, Drummond is forced to delay his plans.
When his mother dies, young Peter Ibbetson leaves Paris and his best friend, Mary, behind to live with a severe uncle in England. Years later, Peter is an architect with little time for women, until he begins a project with the Duke and Duchess of Towers. When Peter and the duchess become great friends, she reveals that she is Mary — but the duke soon suspects his wife of infidelity and challenges Peter to a duel, threatening the pair's second chance.
When reporter Dan Miller is once again late to meet his girl friend, Helen Murdock, because he is working on a story, Helen breaks up with him. Later, in an effort to reconcile with her, Dan misses an appointment with the district attorney, and is fired when his editor learns that the district attorney was murdered in Dan's absence. The man suspected of the crime, Mitts Coster, is rumored to be traveling to Europe aboard an ocean liner. While Dan's friend, photographer Snapper McGillicuddy, fetches Helen to the boat, under the pretense that Dan is leaving town to forget her, Dan searches the ship for Mitts, whom he does not recognize. When Helen arrives, Dan feigns illness, and she admits her love for him. When Helen learns of Dan's ruse, however, she angrily hits him with a package that a passenger gave her when she boarded the ship. The package contains a passport for Dorothy Madden, who greatly resembles Helen, and $2,000 dollars.