When Will Burrows and his friend Chester embark on a quest to find Will's archaeologist father, who has inexplicably disappeared, they are led to a labyrinthine world underneath London, full of sinister inhabitants with evil intentions toward "Topsoilers" like Will and his father.

Thirteen-year-old Sully Stringfellow, his arch-nemesis Izzy Cisco, friend Moleman, and a league of long-forgotten plumber heroes team up to save Nitro City from mutant creatures in the sewers.

Will Burrows believes he is safe at the very center of the earth, in a world that no one knows exists, but the Styx are close behind and will follow him anywhere, while on the surface, Drake and some unlikely allies unearth some critical secrets.

When a roamer trades them an ancient book with only a few pages remaining, Lina and Doon return to Ember to seek the machine the book seems to describe in hopes that it will get their new community, Sparks, through the winter.

As young archaeologist Will Burrows continues to search for his lost father in the strange underground world he has discovered beneath the city of London, he stumbles across a sinister plot with terrible implications for the world above.

"When Hyacinth mixes hot and cold water in a sink in London with disastrous results, she learns that the city was built on magical rivers that are now London's sewers--and somehow her family is connected to the magic"--

In this middle-grade madcap adventure, a brother and sister find themselves in the underground hospital for magical creatures where they must save the lives of millions of magical creatures ... and themselves.

The outer crust is under attack by the subterranean Styx who are turning ordinary humans into walking bombs and incubators for their eggs, and only Will Burrows and his band of retired commandos stand in their way--but the Styx also have problems of their own.

"Now that Hyacinth Hayward knows about the enchanted rivers under London, she's determined to find out more. Unfortunately, London isn't cooperating. Instead, Hyacinth stumbles on a new adversary--a girl who is trying to steal all the ancient stones that keep the city in balance. A girl with glowing, magical fingers, whose entire body is tattooed with spells. A girl called Minnie Tickle. (What? Were you expecting something more . . . fearsome?) To...