In May 1902, a twenty-three-year-old French woman dying of tuberculous peritonitis was placed on a pilgrimage train from Lyon to Lourdes. Three hours into the journey, a young Lyon surgeon examined her, recorded distended abdomen, hard tubercular masses, blue lips, and a fluttering pulse, and wrote in his notebook that she would not arrive alive. He had come on the train specifically to investigate the Lourdes cures as a sceptic.

Her name was Marie Bailly. His name was Alexis Carrel. She had been bedridden for months. He was twenty-nine, agnostic, brilliant, and developing the techniques for sewing severed blood vessels back together. Marie Bailly had been told she would die before the train reached the Pyrenees. Carrel had told her the same thing. Both passenger and doctor had agreed it was probably true. The other physicians on the train concurred.

On the twenty-eighth of May, 1902, Marie Bailly was carried to the grotto at the Lourdes shrine and water from the spring was poured on her abdomen three times. Carrel stood beside her with his notebook open. Over the next twenty minutes he watched, in this order, the massively distended abdomen visibly flatten, the hard tubercular masses he had personally palpated dissolve, her pulse return to normal, her cyanosis clear, her colour return, and Marie Bailly sit upright. She asked for food. By the next morning she was walking. Within a week she had no symptoms. Carrel could not explain it. He wrote what he had seen in his notebook.

Word reached Lyon. The Faculty of Medicine made it clear that no surgeon who entertained supernatural explanations would advance there. Carrel was passed over for every position he had been expected to win. In 1904 he emigrated to Canada, then to the Rockefeller Institute in New York. In 1912 the Karolinska Institute in Stockholm awarded him the Nobel Prize in Medicine for the work that had nothing to do with Marie Bailly: the technique of sewing severed blood vessels together that would later make all modern transplant surgery possible.

Marie Bailly entered the Daughters of Charity of Saint Vincent de Paul in Paris six months later. She lived as a working nun until 1937. Carrel never published his clinical notes in his lifetime. He spent the last six years of his life in conversation with a Trappist monk at Boquen Abbey in Brittany. He was reconciled to the Catholic Church before his death in 1944. His book on Lourdes appeared in 1949. They had both witnessed it. Witnessed. Subscribe.