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.

"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"--

Twelve-year-old Gran and his new friend, Catalina, journey underground to defeat a strange force that threatens their town, Carousel.

"Lynn's own life is full with choir practice, school, shopping for the perfect jeans, and dealing with her free-spirited mother. Then one day her life is saved by a mysterious girl named Blossom, who introduces Lynn to her own world and family who are both more bizarre, yet somehow more sane, than Lynn. Blossom's own family is a small band of outcasts and eccentrics who live secretly in an ingenious bunker beneath a city reservoir. Lynn is enchanted...

In the year 241, twelve-year-old Lina trades jobs on Assignment Day to be a Messenger to run to new places in her decaying but beloved city, perhaps even to glimpse Unknown Regions.