In the quiet mountain town of Rosewood, shy Tamsin uncovers a hollow crystal orb in her grandmother's attic that shimmers with forgotten histories. Drawn underground, she meets Auriel—a silver-haired Memory Keeper—and Brin, a playful cave sprite. Through winding echoing tunnels and luminous moss, they explore ancient festivals of dancing dragons, rivers shaped by poets' verses, and lullabies carved in stone. But a creeping silence threatens to erase these echoes forever. To save the Mystic Memory Keepers, Tamsin must share her own family's fondest story, proving that even the smallest voice can rekindle mighty echoes and safeguard the world's collective memory.