Here’s a nice review from Publishers Weekly!
“In this series kickoff, Taylor (Amelia Earhart: This Broad Ocean) introduces a fascinating world where history took a different turn. The invention of computers in 1880—and their failure a century later—has led to the discovery of strange lands not on any map as well as the rise of steampunk technology in place of gasoline and electricity. Siblings Zander, Kit, and M.K.—14, 13, and 10, respectively—are forced to go on the run after they discover a map created by their deceased father, a renowned explorer, which points the way to a massive hidden treasure, one coveted by the corrupt Bureau of Newly Discovered Lands. As their journey takes them into the depths of a long-hidden region, they encounter all manner of dangers. The author’s evident love of maps and exploration strengthens this Indiana Jones–style adventure, which is filled with nifty gadgets, moments of moderate terror, and high stakes. The retro-futuristic technology, never-before-seen sights, and danger provide plenty of fodder for Roy’s playful illustrations, which have an adventurous, Jonny Quest flair. Ages 10–up. Agent: Esmond Harmsworth, Zachary Shuster Harmsworth Literary Agency. (Dec.)”
— Publishers Weekly