In Siena, in Italy, a six-year-old girl saw Jesus in the sky and was never the same again. This is the first part of the life of Saint Catherine, the young woman who served the sick and became a Doctor of the Church.

A young laywoman wrote letters to the Pope and convinced him to return to Rome. In this second part, Catherine dictates her masterpiece, works for peace in the Church, and gives her life at thirty-three.