A woman who achieved recognition through her books detailing frightening dreams finds herself pursued by an old witch. The author, Emma, returns home and discovers she has to protect not only herself but also the people she cares about when the witch appears. She seems unable to escape a pattern of worsening situations as she attempts to atone for past actions from her youth, while Marianne disrupts her existence. The show is genuinely frightening and comparable to The Haunting of Hill House. Each episode increases the suspense, making it ideal for watching in one sitting. It's rare these days to find a series that can deliver scares rooted in nightmares as effectively as this one does. The shifts between different time periods are skillfully done, contributing to an atmosphere of dread and creating anticipation. This is something everyone should watch, with all the lights on.

Source on TMDB