There was nothing romantic about Psycho, Frenzy, Rope and Shadow of A Doubt. The 39 Steps was probably my favourite early Hitchcock movie, no romance but some witty dialogue. Hitchcock's ice cold blond period came much later !This might be sacrilege to say, but I'm now avoiding all of Hitchcock that is described as a romantic thriller. (Unfortunately that's quite a few movies.) I just expect these prolonged shots of the leading lady where I'm supposed to be admiring her ethereal beauty, I get bored. So I'm sticking to movies that are described as straight up murder.
The movie I'm talking about I saw as a kid, think I saw it back when I lived in Germany. So maybe it was just some German TV thriller, my search continues.