Bob Lawrence (Banks), is holidaying in Switzerland with his wife Jill (Best) and daughter Betty (Pilbeam). A Frenchman they have befriended is murdered in front of him, whispering about a planned assassination that will put the British government in jeopardy. Betty is abducted to ensure Bob's silence until after the assassin (Lorre) has carried out his grim task in the planned setting of the Albert Hall, how can Bob do his patriotic duty but at the same time keep his daughter out of danger? Hitchcock enjoyed this thriller so much he remade it in Hollywood twenty years later. With an excellent cast, superb chase sequences and the terrible drama of an innocent man caught up in circumstances he cannot control, this however remains the superior version.