Interested to hear that there's a German cousin of The Suffolk Miracle (which I also know under the name The Holland Handkerchief). When I was a child, I had a collection of folk stories from the Fen Country called The Dead Moon. The Suffolk Miracle was one of them, and it terrified me so much it gave me nightmares. Still scares me, though I enjoy the song. In terms of spooky/supernatural ballads, I did.