Don't Deliver Us from Evil (1971)

In a Catholic Boarding School in France, the teenagers Anne (Jeanne Goupil) and Lore 9Catherine Wagener) are best friends and they have promised t serve Satan. They spend their summer vacation together and they dedicated to play cruel pranks to servants and neighbors. Soon they escalate their games culminating with the death of a driver that run out of gas on the road. When they return to school, they are aware that there is a police investigation.