The heart lies at the centre of life. For cardiologist Sandeep Jauhar it is an obsession. In this fascinating history he interweaves gripping scenes from the operating theatre with the moving tale of his family's history of heart problems - from the death of his grandfather to the ominous signs of how he himself might die. Jauhar looks at the pioneers who risked patients' lives and their own careers, and confronts the limits of medical technology, arguing that how we live is more important than any device or drug we may invent. Heart is the all-encompassing story of the engine of life.