In the small town of Tréport, France, a young female detective named Sandra Winckler is tasked with solving a bizarre and gruesome crime. Six bodies are discovered in a model home, posed in macabre scenes.es Sandra's investigation leads her to suspect Paul Maisonneuve, a retired police chief with a controversial past. As she delves deeper into the case, she discovers a web of secrets and lies that threaten to destroy the town's idyllic facade. With the help of her partner Justin, Sandra must unravel the mystery before more lives are lost. But the closer she gets to the truth, the more she realizes that nothing in Tréport is as it seems.

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Some TV shows that have similar genres and were produced around the same time as Witnesses include Sugar, Evil, True Detective, Sherlock, Luther, Fool Me Once.