The massively and needlessly convoluted plot is pretty much beside the point since the whole thing is nothing more than a blatant excuse to cram as many gory murders onto the screen as possible — something it does with unabashed gratuitousness — but it all has to do with several concerned parties vying for the inheritance of a secluded bay and the house on its attendant land. We really don't get to care about any of the characters (who can really only be described as such in the most rudimentary sense of the word), so their gruesome demises have no impact save for their graphic savagery when compared to films of its era, in which respect the movie is almost a decade ahead of its time. The work of famed director/cinematographer Mario Bava (PLANET OF THE VAMPIRES. HERCULES IN THE HAUNTED WORLD, DANGER! DIABOLIK , and many others of interest), A BAY OF BLOOD nowadays reads like a textbook "how to" for the films that would imitate this film (and aspects of John Carpenter's far superior HALLOWEEN from 1978) and come to dominate the horror genre of the 1980's and beyond, starting with FRIDAY THE 13th in 1980, and it pretty much invented the following slasher genre tropes:
- Remote location with a lake to facilitate nude swims by the cast's buxom females.
- POV shots as the killer stalks their human prey
- A cast of characters who are nothing more than ciphers to be mutilated, dismembered, hanged, immolated, et cetera
- The "creative kill," in which one or more characters are polished off in ways that simultaneously repel and amuse
- A plot that is utterly irrelevant to what this kind of thing's audience wants to see, namely tons of vicious, gory murders
- Few, if any, real scares, just meat for the hacking
A humping couple is memorably run through with a long spear that penetrates the pair and is seen protruding through the underside of the bed, and much the same thing occurs in FRIDAY THE 13th PART II:
So if you're a fan or scholar of the whole slasher phenomenon of the 1980's (and beyond), A BAY OF BLOOD is definitely worth a look for its Rosetta Stone-like status in one of the horror genre's most (often justly) maligned sub-strata. Plus, even with the passing of four decades since its initial release, it's murders are still quite vicious and genuinely shocking, my favorite being a hooked machete to the throat of a fleeing victim that features a nasty closeup of her throat being slit open. Great for the kiddies!