The fourth in a gripping young fantasy series from the author of
THE HUNGER GAMES.

It's only a few months since Gregor and Boots returned from the Underland,
leaving their mother behind to heal from the plague. Though
Gregor's family receives frequent updates on her condition,
they all know Gregor must return to fulfill his role as the warrior
who is key to the Underlanders' survival. A
ccompanied by his now-talkative little sister Boots, still considered
the honorary "princess," Gregor joins forces with another princess
- 12-year-old Luxa - and Ripred the rat to defend the Underlanders
and the vulnerable "Nibblers," or mice, from the rat army.