This edition of the Roman Missal will be published in the Dioceses of the United States of America, and has been approved by the Conference of Catholic Bishops and confirmed by the Apostolic See.

The work is important not simply for a better understanding today's and tomorrow's Catholics, but also for a correct understanding of our present Liturgy and its place in the western liturgical tradition.

The Bobbio Missal is one of the most important and interesting liturgical books surviving from the early middle ages.

What Happens at Mass presents an understanding of the Mass, how it is to be celebrated, and its profound meaning for the Church and the individuals within the Church.