On the evening of July 18, 1830, an extraordinary event occurred in the life of a young novice. Waking shortly before midnight at the insistent summons of an angel, Catherine Labouré hastened to make an appointment requested of her by the Virgin Mary. Over the next several months, this privileged young woman would understand that she was to be the carrier of a message greater than herself, a message that must remain a secret between her and heaven….