Candy Snatchers, The (1973)

A trio of petty criminals comprised of Jessie (Playboy Playmate and B-movie queen Tiffany Bolling, Bonnie's Kids), her brother Alan (Brad David) and hulking Army vet Eddy (Vincent Martorano) decide to execute a get-rich-quick scheme by kidnapping the daughter of a local diamond mogul. Innocent 16-year-old Candy (Susan Senett, Big Bad Mama) is walking home from Catholic school one day when the three capture her, take her deep into the hills of Southern California and bury her alive with only an air pipe between her and her demise. But it turns out the girl's father is really her stepfather and he couldn't care less what fate befalls her. A difference of opinion regarding the gang's next move gives rise to an ever-quickening spiral into depravity. Shot throughout with an atmosphere of maliciousness, this is an uncompromising descent into the dark side of existence akin to Wes Craven's Last House On The Left.