State Secret [1950 - UK] post war thriller

Visiting in England, famed American surgeon Doctor John Marlowe is decoyed to a middle European country, and discovers the operation he is to perform is on the Vosnian dictator. When the latter dies, he is replaced by a look-alike, but Marlowe is the object of a shoot-to-kill, vicious pursuit by the secret police of Vosnia since it is vital to Vosnia that the dictator's death does not become known. Fleeing, he seeks help from an English-speaking actress, Lisa Robinson, and the two are harried across the countryside before being captured. (Produced by the British team of Frank Launder and Sidney Gilliat "in association with London Films" and released in the U.S. by Columbia Pictures Corporation.)