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.

Family mother and model wife, Agnes hits a vehicle while driving in Paris. She immediately falls in love with the driver of the damaged car.

Imprisoned as an accessory to murder, Catherine gives birth to a son she conceived in prison. Eighteen years later, her sentence served, she is reunited with the boy, Simon, who has remained in an orphanage the entire time. She is accompanied by toothsome prison buddy Sarah, and gradually these people whose lives have been frozen in time "thaw" and get on with the business of living.