This horror certainly has good atmosphere. But when you think the real visual horror sequences of the demon actually harm the movie more than improve it, that's not good. Holden, the skeptical scientist is dull as dishwater, seriously lacking chemistry with Joanna Harrington. I think with her as the lead character it might have been more fun. It doesn't sound right that I actually had more sympathy for Doctor Karswell who is supposed to be the villain and would not have been disappointed had Holden died. Despite the plot or main character couldn't grab me I really liked the séance and hypnosis scene. Thanks to those scenes and the character of Karswell it the movie escapes a failure.