Gregor and the Curse of the Warmbloods #3 by Suzanne Collins

This book is the third in The Underland Chronicles, and I gave it a rating of four out of five. Gregor receives a message that a deadly plague is spreading throughout the Underland, and his bonded bat, Ares, was the first creature infected. Gregor must travel back underground with his two-year-old sister, Boots, but his mom insists she's coming too. Mom gets infected with the plague too, so Gregor, Boots, Ripred, and others head out into the Underland in search of a plant found only in the middle of a dangerous jungle. There is tension between the rats and humans during the journey, and a character presumed dead joins the group as a guide. A huge surprise awaits once they reach the life-saving plants, and the truth of the situation is impossible to believe.

The plot of this book is much like the first two books in the series. The mysterious guide was an interesting twist to the situation, but the actual source of the plague was the true hit of this book. It deals with the length humans will go to when they are at war. Although it's hard to believe, there are countries in the world doing this exact thing.