The Mossheart's Promise

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.

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. 

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

• A Breathtaking Eco-Fantasy: Discover a world trapped inside a giant terrarium, where a creeping mold is destroying everything and the only hope lies in escaping a home that’s turning into a tomb.
• A Desperate Race Against Time: With her mother growing sicker and only one week to find an exit, Ary must unravel clues left by the one person she can no longer trust: her own grandmother.
• A Magical Coming of Age Story: From a timid girl stealing mushrooms to a brave adventurer on a mission, Ary must find her own courage to save everyone she loves.
• Found Family: Joined by her doomsday-obsessed frenemy Owl and a shy-but-sturdy pill bug named Shrimp, Ary learns that the most unexpected allies can become the family you need most.