A group of travelers are forced to seek shelter inside an abandoned jail where a notorious nun named Sister Monday had once been assigned and was suspected of murdering prisoners.

10 years after the events of the original film, a rash of new meathook-murders makes Dan suspect this may be the same Killer responsible for the death of his twin Sister and her friends. Taking matters into his own hands he tracks down the maniac in an underground cavern and not only comes face-to-face with the meathook wielding mongoloid, but his entire sadistic family as well!

A cursed antique toy monkey from the original DeFeo home wrecks havoc and possesses a father after being gifted during an annual family reunion.