Movie from the 60s or 70s. A girl holds a travelling salesman by breaking his leg and ties him to a bed in the middle of a field and drives his car around him.I think she has killed her family and is alone and the travelling salesman tries to help her as she is youngish but when he tries to leave she hurts his leg.As far as i can remember it is an American film in colour set in the country[deep South?] I saw it when i was very young and just remember bits .Hope someonr can help,been bugging me for about 30 years.