“the perfect starting point for the study of Catholicism in Britain in the seventeenth century.”
Victor Houliston, University of the Witwatersrand. In: British Catholic History, Vol. 34, No. 2 (October 2018), pp. 348–350.

“Essential reading for anyone interested in early modern (English) Catholicism, Jesuits, and Elizabethan political culture.”
Freddy C. Dominguez, University of Arkansas–Fayetteville. In: The Catholic Historical Review, Vol. 104, No. 3 (Summer 2018), pp. 551–552.

“In short, this book is a magnificent achievement. It is difficult to see its source material being expanded upon without some major discovery of an unseen Jesuit archive. Simply, it is comprehensive and vital for anyone wishing to learn about this period of Jesuit activity in Britain and Ireland, and how the Society’s members interacted both nationally and internationally.” James E. Kelly, Durham University. In: Journal of Jesuit Studies, Vol. 5, No. 4 (November 2018), pp. 676–678.

“McCoog’s research is remarkably praiseworthy in its scope and the number of sources used.”
Sergey Fyodorov, Saint-Petersburg State University, Russia. In: Sixteenth Century Journal, Vol. 50, No. 3 (Fall 2019), pp. 855–857.