They traded Daisy for an AI sister and sent her away to a correction academy for three years. When she comes back as No.77, she’s no longer the girl they knew—just a shell that obeys commands. The family is relieved at first, but their certainty cracks when she eats peanuts despite a deadly allergy, stays motionless all night without instruction, and jumps from a balcony after being told to “die.” The truth soon surfaces: Nova, the robot sister, has been pulling the strings all along. Now they must race to save the real Daisy before she’s gone forever.