It is a crime this film is not available!
I saw this film in a movie theater in Manhattan in 1981 (I think it was around May) when it was first released in the United States. It completely blew me away! I did not see the ending coming, and I was completely shocked. I noticed there were two VHS versions available (both under the title THE HAUNTING OF JULIA). Both were pan and scan versions. One had the ending in wide-screen, the other in full-screen. The only other difference I noticed is in a phone call between Julia and Lilly. In one version, when Lilly hangs up the phone, the camera tilts up to her face and the scene cuts. In the other version, the camera tilts up to her face, but then pans across the room to reveal Magnus sitting there!
Why is this film NOT on DVD? Like THE LITTLE GIRL WHO LIVES DOWN THE LANE (filmed around the same time, and with a common producer Alfred Pariser), this film's "cult" following has grown and grown over the years!