During a sleepover, twelve-year-old Olivia is accused of causing her friend’s terrifying and inexplicable death after performing a song composed by the enigmatic genius, Milo, which calls forth a demonic entity called “The Crooked Man.” Six years later, Olivia returns to her hometown and is confronted by a series of strange deaths, leading her to suspect that the entity she encountered that night continues to haunt her. The curse dictates that anyone who sings the rhyme is doomed to perish at the hands of this sinister figure.