The plot is based on the Indian folk legend about a female spirit who attacks men at night if they are alone and only leaves their clothes behind. The residents of a town named Chanderi believe in the spirit of an angry woman, referred to as "Stree", who stalks men and whisks them away during the four days of a festival every year, causing many disappearances. To protect the residents, "O Stree, come tomorrow" is written in Hindi with bat's blood on the entrances of all homes, men are advised to not roam alone after 10 pm during the festive season, and move in groups for safety - a parallel of instructions women are usually told to follow for their own safety.
Vicky (Rajkummar Rao), a ladies' tailor in Chanderi, falls in love with a mysterious girl (Shraddha Kapoor), who is only seen during that festival season. Her frequent disappearances and the fact that she's not been seen by anybody else makes his friends suspicious, and they start believing that she could be Stree. After one of his friends, Jaana, is kidnapped by Stree, Vicky researches the myth to save him. He comes across a book in a library owned by a paranologist. Stree attacks Vicky but is driven away by the mysterious girl. She tells them that she has been trying to destroy 'Stree' for the last few years after losing someone close to her and that is why she only comes during the festival season. Jaana is found, but he begins behaving abnormally. More men go missing after Jaana, under Stree's control, erases the word "Tomorrow" from the protective phrase outside everyone's homes, leaving it as "O Stree, come"; an invitation.
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