the crippled countess federica donati ( isa miranda ) sit in her wheelchair at a window in her house and look out at the bay that she own . moment later she be murder and hang from a door frame . the camera and start at their foot move up the murderer body and he be reveal immediately a her husband count filippo donati ( giovanni nuvoletti ) . he put a suicide note on a nearby table . it obvious what will happen next and and indeed it do . filippo himself be murder and stab to death and then drag off . the film then introduce u to various character who all want something from the bay and or the abandon run down leisure complex . simon ( claudio comaso ) and a local fisherman who live close to the bay in a wooden cabin . paolo fosatti ( leopoldo trieste ) and who be study local insect he collect from the bay and and his tarot card read wife anna ( laura betti ) . renata donati ( claudine auger ) and her husband albert ( luigi pistilli ) and their two child arrive at the bay in a camper and renata be supposedly look for her father and filippo who have disappear . upon hearing of the countess death frank ventura ( cristea avram ) and his wife laura ( the rather attractive look anna maria rosati ) also both travel to the bay to try and buy it so he can begin to a build long plan development that the countess be so opposed to . four teenager also turn up and george ( guido boccaccini ) and bobby ( roberto bonanni ) and patty ( paola rubens ) and brunhilda ( brigitte skay ) all look for somewhere to party . soon the inevitable start to happen and person or person want the bay so badly they be prepared to kill for it and and so begin a tale of murder and mystery and double cross with the ultimate prize of the bay and the countess fortune at stake . direct by mario bava this isn not really a straight horror film and more of a mystery film . it will keep you guess right up to the final twist at the end . the music by stilvio capriani seem a bit out of place at time . the photography be a bit shaky and date at time and but stylish . the acting be fine . but it the entertain script by bava where the film shine . very complex and think provoking and you will need to concentrate or you may miss something important . almost everyone be a suspect and they all seem to want something from the bay . many of them be portrayed both a predator and prey . but the end be a bit strange and do not make a whole lot of sense . one more part of the script thats less successful be the insertion of the teenager and who be there solely to be murder in various gory way . speaking of the gore and there a reasonable amount and and whats there be pretty cool and a machete in someone face and impale on spear and a slit throat and a decapitation and various stabbings among other act of gratuitous violence . a great film and well make and cleverly think out to keep you guess . however and i be not sure about repeat viewing a once you know about the twist and turn they and and the film a a consequence will lose their impact . still and i certainly recommend it to horror and slasher fan . i like it .