Michel, a referee has to suffer the consequences of having whistled a penalty against a team which is supported by football hooligans.
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.
When François' wife Cecile was leaving him because of his affairs with other women, she had an auto accident. In this drama, he makes uses of her amnesia to try to win her back and misleads her at every turn in her quest to recover her memories.