Released in 1973, The Candy Snatchers is a sleazy movie that follows a crew of three anti-social miscreants who hatch a plan to kidnap a teenage girl on her way home from Catholic school and then make a pile of loot by making her family pay a substantial ransom for her safe return.
The initial scheme goes off well and in short order the girl is grabbed and buried alive in a field, with only a small tube providing her with air. An autistic and mute boy is a witness to the crime but due to his condition cannot communicate this to his parents. Things quickly go south as the kidnappers discover her step father is not the rich dude they assumed he was, in fact he is rooting for her demise since he stands to inherit money in that scenario. The gang fights among themselves as dread and desperation overtake them and eventually lead to a truly nihilistic conclusion.