A scandal as a wedding present

This is Alfred Hitchcock's 1940 spy thriller. An American reporter John Jones (Joel McCrea) - using the penname "Huntley Haverstock" - tries to expose enemy spies in Britain. In the midst of international espionage, he witnesses the murder of a diplomat but also falls passionately in love. Not one of Hitchcock's most famous works, nor should it necessarily be, but gripping suspense nonetheless.