An elderly heiress is killed by her husband who wants control of her fortunes. What ensues is an all-out murder spree, as relatives and friends attempt to reduce the inheritance playing field—complicated by some teenagers who decide to camp out for fun in a dilapidated building on the estate.

Did we say Argento was our favorite? He’s given a run for his money by Mario Bava. A Bay of Blood, possibly Bava’s most influential film, was too intense for audiences in 1971 (and some today), but remains a landmark of the “slasher” genre and an essential flick for horror buffs.