"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...

Determined to prove her conspiracy theorist father's beliefs about lost Cold War technology, Gillian, her skeptical brother, and their friends journey to the ruins of a vast doomsday bunker before they are confronted by dangerous adversaries.

When Gran and his family move to Carousel, he has no idea that the town is built atop a secret. Little does he suspect, as he walks his sister to school or casually eats a banana, that mysterious forces lurk mere inches beneath his feet, tearing up the earth like mini-hurricanes and causing the town to slowly but surely sink. When Gran's friend, the difficult-to-impress Catalina Catalan, presses a silver handle into a hillside and opens a doorway...

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.

"Many hundreds of years ago, the city of Ember was created by the Builders to contain everything needed for human survival. It worked... but now the storerooms are almost out of food, crops are blighted, corruption is spreading through the city and worst of all -- the lights are failing. Soon Ember could be engulfed by darkness...But when two children, Lina and Doon, discover fragments of an ancient parchment, they begin to wonder if there could be...

Life becomes more interesting for Ananka Fishbein when, at the age of twelve, she discovers an underground room in the park across from her New York City apartment and meets a mysterious girl called Kiki Strike who claims that she, too, wants to explore the subterranean world.