The isolated village that has gone a bit peculiar

related situations
Buck inherits a castle but the local villagers are insane.
There is a famine and they are resorting to cannibalism, they are happy to see Buck, who is a travaler, when he asrrives.
A chemical is released, possibly by the mad scientist that makes the villagers go insane.
Sue, a traveler, is chosen by the villagers as the may queen, she is happy untill she learns they use the may queen as a human sacrifice during the cerimony.