"Gregor and the Prophecy of Bane" is a fantasy novel written by Suzanne Collins, first published in 2004. The story is the second book in the "Underland Chronicles" series and follows the adventures of a young boy named Gregor who discovers a secret underground world inhabited by humans and giant talking animals.

In this book, Gregor returns to the Underland, a place he first discovered with his younger sister Boots, to fulfill a prophecy that foretells the coming of the Bane, a giant white rat who is destined to destroy the humans and creatures of the Underland. Gregor is joined by his friends from the previous book, including the warrior bat Ares, the princess of the Underland Luxa, and the kindly mouse Ripred.

The group sets out on a dangerous journey to find the Bane, facing many obstacles and enemies along the way. As they travel deeper into the Underland, they encounter new creatures and mysteries, and Gregor begins to question the true nature of the prophecy and whether he is truly meant to fulfill it.

Throughout the book, Collins explores themes of loyalty, friendship, and sacrifice. Gregor and his friends must work together and trust each other if they are to have any hope of defeating the Bane and saving the Underland. The characters also struggle with their own personal demons and doubts, making them relatable and complex.

The action-packed plot and vivid world-building make "Gregor and the Prophecy of Bane" an engaging and thrilling read for young adults and fantasy fans. The book also contains underlying messages about the consequences of violence and the importance of understanding and cooperation.

Overall, "Gregor and the Prophecy of Bane" is a well-crafted continuation of the Underland Chronicles series, filled with adventure, emotion, and thought-provoking themes.