Fifteen-year-old Emily has six siblings, but she was also close to her best friend, Lizzie Porter, who died nearly a year ago, and she is still grieving; but Lizzie's family are also grieving, so much so, that they use Lizzie's younger sister, Chloe, as a lure and kidnap Emily, forcing her to dress, talk, and act like Lizzie, and threatening to go after Emily's family if she does not become the replacement for the daughter they lost--and Emily is caught between fear for herself and her family, and concern for Chloe, who she sees is also a victim of Mrs. Porter's madness.