This book is about what goes on inside a paragraph of printed text. As explained by Matthew Carter:
Cyrus Highsmith takes the lid off a paragraph of type and shows its inner workings. There is nothing you need to understand about using type that’s not in this book. Cyrus explains the correct terms for the typographic components of form and space that make a letter, a word, a line, a paragraph, and he does it with clear drawings, simple language and a legible typeface for the text.
The book is set in Ibis Text and Scout, both designed by the author and distributed by Type Network. A custom typeface dubbed CySans was designed by the author exclusively for this book. Simulating his style of hand lettering, it is used for the captions.