In the early days of the Cold War, a spirit of desperate scientific rivalry birthed a different kind of space race: not the race to outer space that we all know, but a race to master the inner space of the human body. While surgeons on either side of the Iron Curtain competed to become the first to transplant organs like the kidney and heart, a young American neurosurgeon had an even more ambitious thought: Why not transplant the brain?

Dr. Robert White was a friend to two popes and a founder of the Vatican’s Commission on Bioethics. He developed lifesaving neurosurgical techniques still used in hospitals today and was nominated for the Nobel Prize. But like Dr. Jekyll before him, Dr. White had another identity. In his lab, he was waging a battle against the limits of science and against mortality itself—working to perfect a surgery that would allow the soul to live on after the human body had died.