I saw this movie over 20 years ago, but with a few others still haunts me. The music of Chopin and Janacek, together with the sepia dark images works very effective on your emotions and mood. Years after I can still feel the effects of this movie with the final epitome when the ghost tries to take the haunted M with him (to the world of ghosts?). A soft wind can be heard blowing through the trees, the music quite soft, sombre and romantic, the light is almost absent: all is set for this final important moment in the movie.
Together with the earlier movies of Ingmar Bergman, Antonioni and the also forgotten masterpiece of Schlöndorff "Die Fällschung" (destruction of Beirut), I rank this movie to the highest order of the art.