And Soon the Darkness (1970)

Jane and Cathy, two English women in their early twenties, are on a cycling tour. While traveling in rural France, they begin to disagree about the route. Cathy would prefer to take things in at a leisurely pace, while Jane is trying to stick to strict schedule. After arguing, they part ways. When her friend fails to rejoin her, Jane begins to worry and returns to the last place she saw her. Cathy has vanished. Alone and with a limited knowledge of French, Jane doesn't know who to trust as she frantically searches for her missing friend.