Those living in Rome causa studiorum don't like to buy many English-language books as they're expensive and heavy (difficult to get home in the end or find a storage place for during the summer holiday).
So when an English book is purchased, it's a big deal. Some days ago I purchased one of the most interesting books I've ever seen: a book entitled The Mass, by Fr. Joseph Dunney. I ask every Catholic family to purchase this same book and read it together as a family.
This book explains the meanings behind the ordo of the extraordinary form of the Missale Romanum and it's a fabulous read.
Buy it here from the Angelus Press: http://www.angeluspress.org/ .