And Soon The Darkness (1970)

Two British girls go on a bicycling vacation in France. After quarrelling the two girls separate. The more responsible of the pair Jane feels guilty about leaving and decides to return to the infamous stretch of road where she left her friend. When she gets there she finds her friend is missing and begins a tour of the surrounding area questioning those she encounters about her friend. However as time passes and there is no trace of her friend Jane imagines the worst and fears that the next person she encounters could be her friends killer. Atmospheric suspenseful and shocking AND SOON THE DARKNESS is a gripping thriller.