Emma is a university professor visiting the small northern Italian town of Voghera, who wants to carry out a study on the bizarre case of the so-called Shanda’s river.
The river was renamed after the brutal murder of a young female peasant Shanda, accused and executed for being a witch in the early 19th century. A local girl Giulia has been organizing for several years a river sightseeing tour narrating the story of the witch Shanda. Emma wants to take part of the tour but gets caught up in a curse that forces her to relentlessly repeat that same day. She’ll keep waking up in her hotel room at 4 am and constantly getting killed by two cult members (enigmatic individuals wearing a mask). Thanks to another member of the tour, Daniel Roth, Emma will unveil the secret of this curse and will resiliently try, by all means, to get out of the loop.