( there be spoiler ) have be into the black art all his adult life london antique dealer neal mottram and jack palance and secretly have monthly and when there a full moon and jam session with his coven of witch . these session be hold in the basement of his antique shop to bring him as well a his follower financial reward in what ever business that their in . worship this african idol name chuku mottram have to provide it with monthly human sacrifice to keep his luck go . that result in him get out of debt and become independently wealthy with his shop use a a front for his murderous activity . the local police be a bit suspicious of mottram since he suspect of be involve in two different murder of woman who be know to him and end up savagely mutilate and and in one case burn to a crisp and and find float in the thames river . with chuku constantly need new blood to be spill to satisfy his gluttonous appetite mottran come up with a plan to do in his old and rich aunt louise and edith even . mottron orchestrate a night out and sleep in with an old flame of his the chubby and chunky dolly newman and diana dors and who run a bed and breakfast in town and whom he hasn not see in over three year . get dolly good and drunk on her favorite brew and cherry brandy and mottran check out of her place and travel 70 mile to aunt louies home . hiding in the closet mottran catch her by surprise wear a halloween mask scar the sick old lady to death . for some strange reason mottran later drive a wooden stake through the dead lady heart and like she be a vampire and and then drive back to dolly . mottran jump into bed with her just a she wake up and from the effect of all the booze she drink and make dolly think that he spend the entire evening and and a good part of the morning and with her . the police lead by this tough talk and no b guy det . sgt . wall and michael jayston and feel that it be mottram who murder aunt louise . how could that be . didn not the coroner determine that aunt louise be already dead before the stake and the so called murder weapon be use to sacrifice and not kill and her by the insane mottram . with her death be the result of mottran scar her to death a fact that the police be totally unaware off . the weak link in mottram chain of murder turn out to be his live in protégée in his antique shop the naive and alcoholic prone ronnie and martin potter . ronnie when he find out about his bos dirty deed come apart and start to hit the bar scene drink himself almost to the point of pass out . at the the same time ronnie get up enough courage to smash to piece mottram evil idol chuku . be tail by the police ronnie lead them to mottram basement where chuku be and where mottram just come back after he offer another blood sacrifice to chuku and hooker masseuse and part time dominatrix sally and suzy kendall . wild final with mottram go completely berserk a he try to defend his idol chuku from ronnie drunken ax attack . beat him up and throw ronnie head first through the store window with the police and head by the rough and ready det . wall and come on the scene to put the cuff on the now craze and hysterical mottram . mottram do not go and or give up and willingly and it have to take a full load of lead from det . wall revolver to finally put the homicidal madman down .