A mystery thriller set aboard the Orient Express bound for Istanbul. A girl is blackmailed into throwing a bomb at the President of a fictional Balkan state with the intention of starting another major war.

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.—Les Adams <[email protected]>