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After the untimely death of her sister, Elise suddenly experiences uncanny things around her. She feels being followed around, but instead sees an image of herself. It turns out that Elise has a doppelgänger named Rose. Their worlds collide when Rose rescues Elise from an accident one afternoon. Rose looks exactly like Elise, but their similarities end there. Out of curiosity, Elise invites Rose into her life, and introduces the latter to her family, her friends, and even her boyfriend, Kyle. As they develop fondness towards her doppelgänger, Elise realizes that letting Rose into her life is a big mistake. With her jealousy brewing, she bullies Rose during a game of "Truth or Dare" that soon leads to a tragic accident. She and her friends cover up the incident and decide to put everything behind them— until they all fall into their mysterious deaths one by one. Who will be left unscathed? How are the deaths linked to Rose's demise?
As the truth about what really happened during the night of the fire is revealed, all the deaths are pieced together. Rose finally gets the justice she seeks, but loses everything she holds dear.
As his conscience tortures him, Henry finds refuge in Elise. Meanwhile, Claire and Elise's relationship worsens as the suspicious mother tries to prove that her daughter is not who she claims she is.
After Jarred's miserable fate, Elise confronts Claire about her illicit affair. Believing that her mother hides many secrets, Elise snoops around to find evidence that will prove her suspicions about her mother.
After Grace's death, Elise gets to bond more with her dad, Henry, as she helps him prepare a surprise for her parents' anniversary. However, their plans go awry when she discovers a dirty little secret about her mother, Claire. Meanwhile, Jarred encounters a freak accident.
Getting another shot in life, Elise makes noticeable changes in her attitude and behavior. She decides to make amends with Kyle's parents, become a more understanding daughter to her dad, and a better friend to Grace. Just as Elise starts making all these positive adjustments, Grace grows suspicious of her best friend.
Following the night of the fire, Elise becomes paranoid and vulnerable. She feels like she is being watched and followed all the time. As her paranoia intensifies, Elise seeks comfort from her boyfriend, Kyle.
Elise's life completely changes after meeting her doppelgänger, Rose. Wanting to fill the void left by her deceased sister, Elise invites Rose into her life and treats her like a twin. Jealousy arises as the people around her grow fond of Rose. Soon, a tragic accident changes their lives forever.