I saw this film by accident back in 1983 as a rental from Blockbuster. I have been hooked ever since, turning many people on to it's original story. The movie is creepy and eerie and yes the ending is open ended by the references and the characters make up for this trust me! It is an old American settlement in the woods with references to witches and druids and the evil that lies within us all. There are some neat Hitchcock like quick pans and sounds with only references to the actual happenings allowing your brain to fill in the pieces nicely. The scenes mostly take place in a dark and omniscient woods. There are some religious references which play into the plot as well. I am looking for it on DVD, you should too.