Kill, Baby... Kill! (1970) on Netflix

Romania, the 19th Century. Dr. Eswai (Giacomo Rossi-Stuart) arrives in a secluded Transylvanian village where he checks into a local inn and meets with Inspector Kruger (Piero Lulli) the local constable who is investigating the death of a young girl employed as a maid at Villa Graps. The inspector has summoned Dr. Eswai to the village to perform an autopsy on the girl, much to the dismay of the locals. With the assistance of Monica (Erika Blanc), a nurse who just recently returned to the village for the first time since she was a child, Dr. Eswai carries out the autopsy. They make an incredible discovery: a gold coin imbedded in the dead girls heart. Monica reveals that this is consistent with a local superstion. Only with money in the heart, can one who meets a violent death ever rest in peace, says Monica. Following the autopsy, Eswai assists Monica back to her home. He is then attacked by a small mob of several villagers who swear vengeance on him for profaning the dead girls body. Only the sudden appearance of a mysterious woman, clad in black, saves the doctor from being beaten to death. But before he can thank her, she disappears into the fog.