L'Homme qui en savait trop

On vacation in St. Moritz, Bob and Jill Lawrence and their daughter Betty befriend a foreigner staying in their hotel. One evening as Jill dances with the man, he is shot through the window. As he dies, he begs Jill to retrieve a note from his room and deliver it to the British consul. Before Bob can fulfil the man's wish, he is handed a note by Betty's kidnappers. The couple returns to England and learns that the kidnappers plan to assassinate a powerful foreign visitor at Albert Hall. Jill attends the concert and distracts the gunman with a scream. The assassins are captured by the police, and Betty is returned to her parents.