A good Ronald Frame dramatisation of Daphne Du Maurier's original short story can be heard here.
Having just watched the 1972 movie, I was impressed by how well it was adapted for the screen. The strange events that take place in Venice are genuinely disturbing because there's none of the usual horror movie stuff. Instead there's the odd attitude of the bishop, the church restoration, the apparently dotty old ladies, confusion with Italian hotel staff etc. The climax is still insanely troubling.