Continental Express (1939)

Aboard a continental express train, Draguisha (Valerie Hobson) is the instrument of a terrorist revolutionary party which seeks to kill the Prime Minister of Bosnia, free its political prisoners, amongst whom is Draguisha's father, and thusly precipitate a war in Europe. Jacques Salvin (Sir Rex Harrison), a member of the French secret police, foils the plot and returns Draguisha to the protective arms of Bordier (John Loder), her fiancé and a French newspaperman.