A high school bandleader captures the interest of a popular co-ed.
"Kilroy Was Here" was a popular expression during World War II, but it's not much fun to John J. Kilroy, who has to try to live with all the jokes and wisecracks regarding his name.
Harry Fielding is an investigative reporter with a brief to covertly document the compromising exploits of public figures. Incriminating evidence captured on his camera is used by his unscrupulous boss, Hamilton, to blackmail the very people they are supposed to be protecting. The tables are turned when Fielding and Hamilton themselves become the subject of scrutiny and are plunged into a world of Subterfuge, Intrigue, blackmail and murder.
Yvonne von Krutz, a Belgian, lives with her German husband Karl, whom she was forced to marry, and her spirited little brother Jacques in a farmhouse on the Belgian countryside. With the German invasion of Belgium, Karl joins the German forces, and Jacques is taken to a reformatory to be trained as a munitions worker. When Karl is taken prisoner, Capt. Jefferson Strong, an American engineer, assumes the German's identity and discovers an underground supply of explosives near the von Krutz farm. By means of a tunnel, the Americans plan to mine the explosives. To save Jacques and a group of children from the munitions factory, however, Jefferson sends them across the American lines through the tunnel, but they lose their way, and he is forced to disable the mine. Jefferson is court-martialed, but King Albert of Belgium, who has befriended little Jacques, intercedes on his behalf. Learning that Karl has been killed, Jefferson pursues his budding romance with Yvonne.
Joan Daley, a New York booking/press agent, attempts to recruit two local stand-ins, Jinx Terry and Lois Morgan, when the Cuban sister-act, Marianela and Rosita she as booked into the nightclub for which she works fails to materialize. Complications arrive when the real Cuban sisters show up.
To avoid getting a speeding ticket Walter poses as an expectant father rushing to see his wife; when the cop follows him, he's forced to come up with a wife and child.
The Marquise de Saint-Ange wants to marry her niece Nicole, but the young girl, put off by the chosen suitor, flees with her friend Jacques.