Sarah, a struggling young woman living in Brooklyn, agrees to volunteer as an experimental test subject for a pharmaceutical company called Dynamic Health Cure in exchange for money to help her and her mother, who has Alzheimer's. A nanochip called LEXX is implanted in her cerebral cortex, designed to use artificial intelligence to take control of the body at the onset of disease. When the implant turns sinister and starts ordering her to commit crimes, Sarah is forced into a murderous spiral and must fight to survive.