If you’re looking for a horror series that will genuinely mess with your head, Marianne delivers nightmares like few others.
Netflix trailer for Marianne leaves fans terrified of new horror series  release - The Mirror

This chilling French horror follows successful horror novelist Emma Daubigny, who returns to her quiet hometown only to discover that the terrifying witch Marianne — the demonic character from her own books — has somehow come to life and is now stalking her in the real world.

What begins as psychological unease quickly spirals into pure, relentless terror. The series is packed with disturbing imagery, creepy atmosphere, and shocking moments that have viewers saying they can’t sleep and keep seeing shadows in their rooms.
Netflix's "Marianne" Will Not Be Returning for a Second Season - Bloody  Disgusting

Fans have flooded social media with warnings like:

“I’m actually scared for my life after watching this.”
“Thank you Netflix, I can’t turn the lights off now.”
“Marianne is the scariest thing I’ve seen in years.”

Despite its relatively short 8-episode run and being sadly canceled after Season 1, Marianne has earned a cult following as one of the most effective and unsettling horror series on Netflix.
Netflix's Marianne review - is it worth your time?