Author Blaire Barrington and doctor Kate English were best friends until Kate's wedding, when Blaire and Kate fought and Blaire was replaced as Kate's maid of honor. They have nothing to do with each other until years later when Kate's mother, Lily, is brutally murdered. Kate and Blaire had been such close friends that they spent holidays and weekends together and during their last year of high school, Blaire lived with Kate's rich family. So when Kate's mother is murdered, Kate reaches out to Blaire and asks her to come be with her.
Once the funeral is over and Kate starts getting threatening texts and finds small, dead, birds and animals with warning notes, she needs Blaire even more.