Womanizer Manuel Ramos is hunted down by a very strange couple: killers. Is the girl a let down ex-lover

After a harrowing breakup, Marcel returns to his favorite hotel to find his room occupied by a journalist, whom he attempts to impress.

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.