An Alfred Hitchcock film.  See IMDB entry above for more details.

Johnny Jones is an action reporter on a New York newspaper. The editor appoints him European correspondent because he is fed up with the dry, reports he currently gets. Jones' first assignment is to get the inside story on a secret treaty agreed between two European countries by the famous diplomat, Mr. Van Meer. However things don't go to plan and Jones enlists the help of a young woman to help track down a group of spies.  Written by Col Needham {col@imdb.com}

Johnny Jones, an insubordinate city desk reporter, is sent to London as a foreign correspondent. There he interviews Van Meer, leader of a peace movement endorsed by Universal Peace Party head Stephen Fisher. Johnny finds fisher's pretty young daughter, Carol, more interesting than the movement. In Amsterdam, Van Meer apparently is assassinated. Johnny and journalist Scott ffolliett follow the assassin into the countryside. Johnny investigates a windmill and find the real Van Meer, a drugged prisoner. His captors escape with their prisoner, and Johnny's story is not believed. After attempts on Johnny's life, Carol believes him. Now in love, they return to London, where Johnny realizes that her father is actually the leader of the conspirators. Johnny tries to protect Carol, who is totally innocent, but she misinterprets his motives, and they quarrel. He and Scott try without success to convince Scotland Yard of Fisher's conspiracy to stall peace efforts. Then war is declared. On board a clipper plane, Fisher explains to his daughter that he was only being loyal to his native country. Johnny, also on the plane, tries to make up with Carol. Written by alfiehitchie