The Secrets of Underhill

Written by Kali Wallace

Narrated by Gail Shalan

A young apprentice fights to save an ancient grove of magical trees in this riveting fantasy adventure, perfect for middle grade fans of Kelly Barnhill and Jessica Townsend.

Nick Sixsmith has spent her whole life on the road. The daughter of a traveling arborist, she moves from town to town with her mother, caring for the ironwood groves that people rely upon for survival. When a dangerous blight threatens these magical trees, the Sixsmiths must journey to the city of Mistwood for answers.

Nick can’t wait to explore everything Mistwood has to offer: the bustling markets, the neighborhoods nestled behind a roaring waterfall, and the vast ancestral grove of ironwood trees. But dark secrets simmer beneath the surface as people start to disappear and tensions in the city reach a boiling point.

As the mystery grows, Nick and her new friends must follow the trail where it leads them—underground, to a strange and enchanting place called Underhill. Only there, among the roots of the ancestral grove, will Nick find a way to save the ironwood trees and the city she’s come to love.

This immersive fantasy adventure combines vivid world-building with timely themes of environmentalism, and young listeners will be riveted until the final word.

• Language: English
• Publisher: Penguin Random House Audio Publishing Group
• Release date: Jun 17, 2025
• ISBN: 9798217172481

Kali Wallace

Kali Wallace is the author of two novels for teens and many short stories. She studied geology for years but now devotes her time to writing. She lives in Southern California. You can find her at www.kaliwallace.com.