"In the underground city of Caverna, the world's most skilled craftspeople toil in the darkness to create delicacies beyond compare-- wines that remove memories, cheeses that make you hallucinate, and perfumes that convince you to trust the wearer, even as he slits your throat. On the surface, the people of Caverna seem ordinary, except for one thing: their faces are as blank as untouched snow. Expressions must be learned, and only the famous Facesmiths...

A completely implausible earthquake sets Frederik Sandwich and Pernille, a mysterious stranger, on an adventure through secret and forbidden places in their small town.

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

"It was supposed to just be a normal basement--some storage boxes, dust, you know, the usual basement stuff. But when Milo is sent by his mother to fetch a sock from the basement of the historic home they've moved into, Milo finds a door in the back that he's never seen before. Turns out that the basement of his house is enormous. In fact, there is a whole world down there. As Milo travels ever deeper into the Basement World, he meets the many Things...

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.

As fourteen-year-old archaeologist Will and his friends plummet down a subterranean pore, they face deadly creatures and discover a strange fungal shelf, which not only reveals artifacts from ancient civilizations, but clues to a lost land at the end of the Earth.

"Behind a hole in their basement wall, Chirri and Chirra discover a network of tunnels. Join them as they visit moles, discover caves full of glowing flowers, poke at the roots of growing plants, traverse a subterranean lake, and spend the night with a family of badgers!" --

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.

When eleven-year-old Gregor and his two-year-old sister are pulled into a strange underground world, they trigger an epic battle involving men, bats, rats, cockroaches, and spiders while on a quest foretold by ancient prophecy.

"Have you ever wondered what's under the ground? A fascinating world lies hidden there. In an exciting journey into the Earth, young children can lift flaps and peep into holes to find ants and bunnies, pipes and trains, fossils and even lava!"--Publisher's description.