When Kylie is nearly killed by her vengeful twin sister, she is left with more questions than answers. Nothing about her life is as it seems. For a year, Kylie tries everything she can to release her nightmares and unlock her hidden memories. But nothing seems to work. With no other options, she decides to undergo an experimental brain surgery in the hopes that she will finally discover her true past. But Kylie's nightmares have only just begun. Kara may have run away from the crime scene, but she isn't done with Kylie just yet. In letters to her sister, Kara tells her own story of her escape, the new life she's made for herself, and most importantly- their past. And the night before Kylie's brain surgery seems like the perfect time to read them all. What is the truth? What is a lie? And who is the real monster?