Eleven-year-old Gregor and his younger sister, Boots, return to the Underworld beneath New York City to find the cure for a terrible plague that threatens the life of their mother, as well as the lives of the people, bats, and rats who populate the underworld.
This Gregor book didn't capture me quite as much as the others, but still an exciting tale. The characters are charming and I look forward to hear where the adventures go from here.
