On the island of Saint Helena, a prisoner Napoleon resisted allies who, through the voice of the English governor, Hudson Lowe, tried to humiliate him, break him, poison him in the figurative sense of the word, and perhaps literally.

An adaptation of La Sorcière from Jules Michelet

The "black robe" in the title of this suspense film belongs to a female lawyer, Florence Nat who has just lost a case in which she defended Simon Risler, a man wrongly accused of murder. Risler escapes before he can be put in prison, and seeks help from attorney Nat in finding the real killer, partly by going after the police inspector who framed him in the first place. A retired surgeon, in the process of setting up a drug rehab clinic gets involved in solving Risler's case, and soon the solution seems to be pointing to high-ranking figures with every desire and ample means to keep the truth well-hidden.

Laurent, a seemingly normal young man, is looking to join a witches’ sect that resides in a forest near his house. The only thing is Laurent’s wife Aline also needs to join the sect in order to complete his initiation. Aline is understandably reluctant, so the sect’s heads design a series of events designed to break her down.