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The mini docs-series dropped on 20th November and is already proving popular, no doubt helped along by the fact it was one of the most famous French news stories in the eighties.
The documentary which is split into five one-hour episodes, takes a deep dive into the unsolved murder of a young boy named Grégory Villemin who was found on October 16th 1984 in the waters of the Vologne river in Vosges, France.
The Netflix description reads: "When their 4-year-old son is murdered, a young couple fights a twisting and arduous battle trying to identify a frustratingly elusive killer."
The series is in French, but naturally you can switch on those subtitles and still get your teeth into this mystery.
The trailer therefore is in French too and while we've included it in this article, unless you have French as a second language you'll struggle to understand what's going on. But let us roughly translate it.
The trailer opens on a secluded house in the French countryside that has gravel on its drive way and the voiceover says that Grégory was abducted outside his home as he played there.
As it pans to the house, the voice says that the last thing Grégory's family heard about him was a phone call from a man who said their child was in the Vologne River.
The voiceover then skips to another person who describes the case as "fascinating".
He goes on to say that he remembers the photo of Grégory in the newspaper as he was so cute.
It says the story captivated France particularly because of the Villemin family being working class, friendly, open people.
However, it then suggests there was someone who wanted to harm the family - an anonymous person who harassed them and started to make their lives hell through phone calls and letters.
He also announces the crime to the family before it took place.
The trailer then flits to press photographing people in the street and the voiceover says that four or five people close to the family were suspects.
Next up a newsreader on screen announces a "twist" in the case, whereby two witnesses described the same person for a police sketch who they think murdered the little boy and it looks suspiciously like a family member - Grégory's second cousin - Bernard.
But suddenly the trailer flits to newspaper articles suggesting it was a woman who committed the crime.
But will we ever find out?
Even if you can't fully understand the trailer, it still looks seriously sinister.
Well, I wasn't expecting to cry tonight, but here I am. Just finished watching the first episode of Who Killed Little Gregory? and my heart man..:broken_heart:
- Evelyn:hearts: (@_evelynvanessa) November 21, 2019
This new Netflix series, Who Killed Little Gregory, is creepy AF.
- Alie :virgo: (@ophelialie) November 21, 2019
For the true crime binge watchers: "Who Killed Little Gregory" on Netflix is intriguing and disturbing in equal measure.
- Sarah (@sarahmufc93) November 20, 2019
The reactions are making us want to watch it too, even if it does sound heart-wrenching and disturbing in equal measures.
One Twitter user said: "This new Netflix series, Who Killed Little Gregory, is creepy AF."
Another added; "Well, I wasn't expecting to cry tonight, but here I am. Just finished watching the first episode of Who Killed Little Grégory? and my heart man."
A third commented: "For the true crime binge watchers: "Who Killed Little Gregory" on Netflix is intriguing and disturbing in equal measure."
You can watch Who Killed Little Gregory on Netflix now.
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