Rod Steiger stars in this violent horror. A group of prosperous young people plan a camping trip in the wilds of the Pacific Northwest, but they are forced to make an emergency landing on an isolated island. They end up staying at a house run by the old-fashioned Ma (Yvonne De Carlo) and Pa (Steiger), an elderly couple who seem to have stepped out of a Norman Rockwell painting. Little do the group know that Ma and Pa are also the heads of a vicious serial killing family.