Su Wan, a jewelry designer, raises a Burmese python named Jin Lin. One day, the snake presses against her as she sleeps, seemingly measuring its prey. A veterinarian friend warns her that this is a sign the snake is preparing to swallow her. Soon, her husband takes out a massive insurance policy, her best friend secretly conspires against her, and a snake trainer leaves behind a deadly code. A plot slowly unfolds around one chilling question: can a domesticated snake turn against its owner? Su Wan transforms from prey into predator, embarking on a harrowing journey of self-rescue as both snakes and people turn against her.