The Hunger Games Series

In the ruins of a place once known as North America lies the nation of Panem, a shining Capitol surrounded by twelve outlying districts. The Capitol is harsh and cruel and keeps the districts in line by forcing them all to send one boy and one girl between the ages of twelve and eighteen to participate in the annual Hunger Games, a fight to the death on live TV.

The Underland Chronicles Series

This series tells the story of a boy named Gregor and his adventures in "Underland", a hidden land under New York City. The Underland is inhabited by humans, who live in the stone city of Regalia, along with various giant versions of such creatures as bats, snails, moles, scorpions, cockroaches, rats, lizards, mice, ants, snakes, fireflies, and spiders which they call fliers, slimers, diggers, stingers, crawlers, gnawers, hissers, nibblers, cutters, twisters, shiners, and spinners, respectively. According to the author, the series involves many topics relating to war, including biological warfare, genocide, and military intelligence.