A dragon's thank-you becomesa doorway to a hidden world. When Ember, the baby dragon, returns to Levi and Wyatt's backyard, she brings more than gratitude. She brings a mysterious silver-wood box: the Forever Imagination Machine, made by the elves who care for the dragons of Emberroot Hollow. The machine does not make toys, candy, or homework disappear. It makes doors for stories. And when the boys turn its silver handle, they step into a glowing forest of sleeping dragons, tiny root houses, and one very serious elf named Brindlewick. But the story they enter needs their help. High in the Wishing Thorn Tree, a silver dragon egg is trapped, and only kindness, courage, and one last cracker can set it free. A magical follow-up to The Dragon at the End of Bramble Lane. A story of the value of imagination to everyone.