My rating: 4 of 5 stars
This was probably the best book in this series. Gregor has to come back to the Underland because he is desperately needed. His mother wants no part of him going back, but she allows him to return for a meeting as long as she can go with him. That means that Boots is to return also.
When Gregor returns it is to find that the Bubonic plague has appeared and his bat, Ares, is terribly afflicted. Gregor is conflicted about going on the quest, but when he finds that his mother has contracted the plague, there is no question about his participation.
The quest introduces some more fascinating characters to the series and is filled with adventure. Some of the main characters have begun to change as their involvement with each other brings out the best and sometimes the worst in them. More of the history of the humans and their treatment of the other creatures is revealed and a lot of it isn't pretty. Our heros succeed, but not without great cost.
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