there not a single scary moment in this boring albeit well make hammer entry . christopher lee be an excommunicated priest who somehow manages to promise to give the devil a daughter . richard widmark be the hack horror novelist try to stop him . the idea of team these two famous screen baddie be promising and but they share scant screen time together . a dubbed nastassja kinski play a young nun and denholm elliott be her father and who try to renege on his deal with lee . it a lousy movie all around and even manages to waste honor blackman ( a widmark sharp tongued literary agent ) . base on the ( presumably well ) novel by dennis wheatley and this film surely exist solely to cash in on the exorcist craze of the early 70 .