THE FIRE SPIRITS by Paul Busson
“#5 The Fire-Spirits. A strange tale of a young man’s involvement with a bewitching peasant child, mountain legends, and the quest for German unification. The English translation is said to be heavily expurgated, but I haven’t read the German to compare.”
-“13 Best Non-Supernatural Horror Novels”, by Karl Edward Wagner (Twilight Zone Magazine, 1983)