From Netflix:

Faced with a series of grisly unsolved murders, a police commissioner turns to imprisoned serial killer Jeanne Deber and her estranged son for help.

From Netflix you can stream the only season of this French serial killer story.  Each of the 6 episodes lasts about an hour. French audio with English subtitles.

Jeanne Deber is an imprisoned serial killer.  Now someone who has studied her crimes is a copy cat who reproduces her murders in exact detail.  Damien Deber, her estranged son, has been enlisted to work with his mother to find the copy cat.  Possibly Jeanne’s intuitions will help the authorities.

Damien is a tortured soul (who always looks tortured)  whose personal relations are equally tortured.  More than just another serial killer series,  this highly inventive story centers around family, friends, and a past filled with secrets.  Jeanne Deber is a beautiful but stone-faced mystery woman.

Warning; the murders are very, very, very grisly. If you can get past those sights, then

DO NOT MISS!