At the beginning of the 19th century, something happened to disrupt the geography of time, and all the ages of the world were thrown out of alignment so that the United States, now called New Occident, may be in the 19th century, but Mexico could be . All of these Ages exist side by side, and intrepid explorers travel from age to age, mapping this post-disruption world. But maps are more than just symbols on paper. Cartologers use magic to create maps that show the weather, past times, and human memories that bring places to life.
One of the greatest of these cartologers is Shadrack Elli, Sophia Tims' uncle. Now he's been kidnapped, leaving behind a clue that prompts Sophia to follow him out of New Occident to the mysterious lands to the south. She's accompanied by Theo, a mysterious boy from those same southern lands who may be more than he seems. Along the way, the pair encounter friends and foes and plenty of adventures as Sophia learns that her uncle may possess knowledge of a very special map - one that might just undo the Great Disruption itself.
The best part of this book, in my opinion, is the wonderfully realized world that Grove, a debut author, has created. In plot, it reminds me at times of The Golden Compass. and I think it would appeal to fans of Pullman's book. The Glass Sentence is the first of a planned trilogy and I look forward to reading the next installment.