The Mossheart's Promise

Written by Rebecca Mix

Narrated by Caitlin Kelly

From New York Times bestselling YA author Rebecca Mix comes the first book in a breathtaking middle grade fantasy duology about a young fairy who has always lived in her heroic grandmother’s shadow but now must step up and embark on a quest to save her mother from the ever-creeping mold overtaking their world.

Perfect for readers who loved Brandon Mull's Fablehaven, The City of Ember by Jeanne DuPrau, and Endling: The Last by Katherine Applegate.

The mold takes all.

Twelve-year-old fairy Canary Mossheart knows this better than most. A few years ago, the mold took her papa, and even her famous, former-chosen-one Gran never found a cure. So when Ary's beloved mama falls ill, Ary decides it’s taken enough. Armed with only a bucket and a prayer, she sneaks out to find a magical, underground lake whose healing waters are straight out of Gran’s adventures. 

But when Ary gets there, the lake’s bone dry, and instead of healing waters, she finds a terrifying secret: Her entire world is actually trapped inside a giant terrarium—one they were meant to leave centuries ago. Worse, Gran knew and hid the truth, dooming Ary and her generation to a dying, rotting world.

Now, allied with only her doomsday-obsessed frenemy, a timid pill bug, and a particularly grumpy newt, Ary has one week to unravel the clues and find a way out of the terrarium—or they’ll be trapped for good. .

• Language: English
• Publisher: HarperCollins
• Release date: Sep 5, 2023
• ISBN: 9780063254084

Rebecca Mix

Rebecca Mix is a fantasy author and Michigander who writes about messy girls and creepy magic. Her debut novel, The Ones We Burn, is a witchy, sapphic dark young adult fantasy. Her work has been featured by BuzzFeed, Tor, Bustle, HuffPost, and more. If you can’t find her, she’s probably goofing off on social media @MixBecca, or attempting to sneak yet another plant into the house.

Reviews for The Mossheart's Promise

[Sybil Milne · Rating: 4 out of 5 stars]

Unexpected and delightful. This story isn’t what a typical over-40 might enjoy as I’d say it’s more fit for Middle grade to YA readers— still, I found myself completely immersed in this story.
A young fairy’s journey to save her mother and as she discovers that all she knew to be true of her jaded Gran, and Terra’s last hero- she finds unlikely friendship and a world beyond her own… there’s more to this story than meets the eye. I’m happy I gave it a chance.