This is Hessler's second film in collaboration with Price. When I think of this movie, I can't help but feel that it perfectly sums up how many of Price's movies from the 70's turned out - inconsistent. The story is about a serial killer on the loose who drains his victims of their blood. The police, in hot pursuit, are eventually lead to Dr. Browning (played by Price). A scientist conducting experiments under the pretense of cancer research, his true motives become clear after further probing. I was disappointed by Hessler's work in this film. Out of the three he did with Price, The Oblong Box still remains the strongest. Price is excellent, but not in it until the end. Peter Cushing and Christopher Lee also make an appearance but their characters are not very memorable. Ultimately, this seems like a dissatisfying way to start off the 1970's; misusing a great cast for a poor screenplay.