Prosper Louis Pascal Guéranger (1805-1875) re-established the Benedictine order in France, repaired that country's relationship with the Holy See, and fought against Gallicanism, Jansenism, Naturalism and anti-ecclesiastical Liberalism; a true warrior for Christ and His Church.
His work fell into disfavor with liturgical scholars during the two decades leading up to Vatican II for its supposed "romanticism" and "neomediaeval irrelevancy"; shocking, isn't it, that modernist, rationalist academics agitating against tradition would trash Guéranger?
This book is packed with information on the Tridentine Mass. If you're not up on Latin, I recommend keeping one of the inexpensive Latin Mass booklets nearby for help with translating the Latin references. Each part of the Mass is given a wonderful explanation of its meaning, symbolism and origins, including the rubrics (the instructions to the priest and the servers.) He takes us through the entire High Mass, explaining that the only way to understand the Low Mass is in the context of the High. Guéranger was obviously a true student of Church history, but tells it in a very engaging way - neither condescending nor overly-academic.
I found this book invaluable. One of the features is a full reprint of the Ordinary of the Mass at the end (making up about an 8th or so of the book), and side by side with it is a translation; but not exactly: in many places, it falls (nicely, I think) into more of a meditation or paraphrase of the Mass - notes, if you will, by a student of the liturgy.
The translation by Rev. Shepherd is extremely readable. This book is small (4"x6"), with sturdy, leather-covered boards and a gold ribbon. I can't think of anything I didn't like about it. If you're planning on attending the Latin Mass, or have been attending and want to understand it better, or are simply curious, this wonderful book is a must-have.