A device that can save a life is also one that can end it
Kadence, a new type of implanted defibrillator, misfires in a patient visiting University Hospital for a routine medical procedure—causing the heart rhythm problem it's meant to correct. Dr. Kate Downey, an experienced anesthesiologist, resuscitates the patient, but she grows concerned for a loved one who recently received the same device—her beloved Great-Aunt Irm.
When a second device misfires, Kate turns to Nikki Yarborough, her friend and Aunt Irm's cardiologist. Though Nikki helps protect Kate's aunt, she is prevented from alerting other patients by the corporate greed of her department chairman. As the inventor of the device and part owner of MDI, the company he formed to commercialize it, he claims that the device misfires are due to a soon-to-be-corrected software bug. Kate learns his claim is false.