A quiet presence in the small French town of Chartres, Agnès Morel can be found cleaning the famed medieval cathedral each morning. No one knows where she came from or why. Not Abbé Paul, who discovered her sleeping on the porch twenty years ago, and not Alain Fleury, the irreverent young restorer who works alongside her each day. She has transformed each of their lives in her own subtle way, yet no one suspects the dark secret Agnès is hiding.