The Firebird Song by Arnée Flores (Ex-Library HC/DJ)
Young Prewitt has only known time without the Firebird, a life of constant cold, as his village is afraid to tempt the volcano monsters with even the feeblest fire. But he has heard whispers that the kingdom's princess survived the attack . . . and he is certain that if he can find her, together they can save Lyrica.
Princess Calliope has no memories beyond living on her barge on the underground lake. But as she nears her twelfth birthday, she is certain there is more to life than the walls of a cave. When Prewitt finds her, he realizes that she is the missing princess: the only hope for Lyrica. Determined to decipher the meaning of her mother's strange message and find the Firebird, Calliope and Prewitt set off on a quest that puts them in more danger than either of them ever anticipated.