At the Texas Heart Institute, surgeons Billy Cohn and Bud Frazier spend years chasing an idea that sounds impossible: a heart that doesn't beat. Their device, a continuous-flow pump adapted from technology used in mechanical ventricular assist devices, keeps blood moving through the body without the rhythmic contraction that has defined a living heartbeat since medicine began measuring one. The film follows their work through animal trials and into March 2011, when they implant the pump in a dying patient and, for the first time, a person with no pulse survives and recovers. Interviews with Cohn and Frazier lay out the engineering problems they had to solve and the skepticism they faced from colleagues who saw the pulse itself as a precondition for life. Hospital footage and lab scenes ground the science in the day-to-day work of building and testing the device. The result reframes a basic assumption about the human body, showing that circulation, not rhythm, may be what actually keeps a person alive.