In spite of it's rather lurid title, this is really a pretty good movie, similar in some ways to The Night Stalker and The Night Strangler. A horrible series of killings, committed over a period of seven days, has been happening once every 28 years since the 1800s. A baron-turned-vampire is suspected. We have the added attraction that this vampire can sometimes be invisible! The baron's handsome great grandson moves into his ancestor's castle to try and figure things out, but the grisly killings continue. Rated R for nudity and violence.