This book is much more than just a follow-up to the author's "Annus Horribilis". That was an introduction to the Latin which we find all around us, but this is much wider in scope, though it retains all the helpful notes and background information. It is also the same size and format as the previous book, with another funny cartoon cover.
Annus Mirabilis begins with curses and letters from Romans living in Britain, but moves quickly through the centuries to medieval hymns and then post-renaissance Latin prose and poetry -- as well as extracts fom More's Utopia and Galileo and Descartes among others, he even includes Latin extracts from the letters of Sterne and Smollett. Stuffed with all this rare neo-Latin, the book fills a big gap in traditional Latin courses which tend to concentrate solely on Latin as used by the Romans. (The Smollett letter is both hilarious and tragic, as he complains to a French quack doctor about his various illnesses! The Sterne letter is rather fruity, as you might expect from the author of Tristram Shandy.)
Along the way this book also includes letters from Cicero and Augustus, Heloise and Abelard and others, and even finds a new way of approaching the difficult subject of Latin poetry -- Walker introduces it first by looking at examples of medieval accentual verse (hymns etc) and then by scrutinising church epitaphs (everyday Latin, you see) for quantitative verses in the Classical manner and explaining the scansion for each. If you ever wanted to know what a Leonine rhyme is, this is the place to find out.
It doesn't really matter if you haven't read Annus Horribilis -- as Walker says in his introduction, he's designed this new book to be a companion to any more traditional Latin course as well as a sequel to his own book.