What is the author's style in Holy Blood, Holy Grail by Michael Baigent?

Holy Blood, Holy Grail is written in proper, crisp English. There are many phrases in the book that are presented in their original language with the predominant language being French as well as some Latin phrases. While some of these foreign phrases are translated, many are not. The text does, however, tend to aid in the reader's comprehension of the meaning even if the text is not translated. There are also many unusual and difficult words sprinkled throughout the text, but again the surrounding text does supports the reader's comprehension of the meaning.