In Edinburgh, 1895, Dr. Peter Braw performs a groundbreaking operation: replacing the failing heart of Douglas Key Grant, 7th Duke of York, with a mechanical marvel of his own invention. Lauded as a miracle of science, the procedure binds physician and patient in ways neither can escape. What follows is a story of invention and erasure, of forbidden love and public legacy, where the line between progress and tragedy is as thin as a heartbeat.