Ms. Tenney (Brenda Fogarty) and a group of summer school students are on a camping trip in the desert to study ancient native cultures and to hike through the Grand Canyon. But when their bus breaks down in the middle of nowhere, a trio of bikers, led by the demented Al (Zalman King) finds them and tricks them into heading out to an abandoned farmhouse. Fearing for their lives, the girls and their teacher try to survive the night and the short tempered, psycho biker Al.