I became aware of this book while teaching a course on the Church in the modern era. The book represents a survey of the 21 general (ecumenical) councils of the Church, from the Council of Nicea I (A.D. 325) to the Second Vatican Council (1962-1965). The book was first published by Paulist Press in 2002, which was the 40th anniversary of Vatican II.
Author Bellitto presents each council in the context of history, and within the group of general councils of each era surveyed. We are shown the difficulties faced by the Church, era by era, and the steps taken at a council or councils to address the issues of the day. Repetition and uniqueness in the context of councils also give the reader to understand that, while Councils are not very frequent (21 councils over 17 centuries), they are, indeed, an important part of the development of the Christian story. Vatican II, the council of our era, is given special, detailed consideration, both in terms of the process that Council endorsed in its day-to-day working over the 6 years from its convocation (25 January 1959) to its conclusion (8 December 1965), and in the first 20 years of its implementation.
A final comment that I could make would take up what the author Bellitto has to say about the lasting influence of General Councils. It takes decades, even centuries, for the Church to implement a Council's deliberations. That is why, Bellitto affirms, it is not proper to say that we are living in a post-Vatican II Church today, but in the Vatican II Church, since after a half century, we are still only beginning to scratch the surface of the Council's teaching, and have much yet to do before we can implement its provisions.