Sets the scene for the future of the Catholic Church. Gives a fair and balanced picture of what actually took place. The author could have been much more critical of the efforts by vatican Curia people to manipulate the matters debated, and the statements that appeared, but he resists the impulse. The result is a factual account of the proceedings, which was what I was looking for - but I would have enjoyed a rather more pointed approach, highlighting the struggle by vatican officials to maintain power and control - the 'correct' way of viewing things, according to them.
No doubt Vatican II was a breakthrough in many ways, as John XXIII intended, but much contentious ground was not dealt with - celibacy of clergy, ordination of women, clarification of questions about Infallibility, collegiality of Pope with fellow bishops. Perhaps an unquestioned traditionalism within the church, a reluctance to criticise, an exaggerated view of papal authority made it impossible for the bishops to discuss in a rational, scripturally based way; but the need remains.
Vatican III is necessary, and at that time it will be a good thing if another fr O'Malley is there, providing a truthful, accurate account of the proceedings, but this time with a rather more critcal bite.