This book takes us back to Zombay, the imaginary country created by William Alexander in Goblin Secrets. We are now introduced to a brave girl names Kaile, who dreams of pursuing music. Her dream seems to come true one day when a goblin gives her a flute made of bone. However, she quickly realizes that when you touch it, something terrible happens: she loses her shadow. In the great kingdom of Zombay, when someone loses their shadow, they are considered to be dead. Regardless of the fact that she is moving and breathing, her parents soon kick her out of the house since they believe she is haunting them.  Not only must Kaile find a way to revert back to how things were before, but she also must find the melody that allows her to save people from a flood that threatens to destroy all of Zombay.

Este libro nos conduce de regreso a Zombay, el país imaginario creado por el escritor William Alexander en El secreto de los duendes. Ahora nos encontramos con una valiente chica llamada Kaile, quien sueña con dedicarse a la música. Un día sus sueños parecen volverse realidad cuando un duende le regala una flauta tallada en un hueso. Sin embargo, al tocarla ocurre algo terrible: Kailie pierde su sombra. El problema es que en este reino fantástico, cualquiera que se separe de su sombra se considera muerto. Ello a pesar de que siga moviéndose y respirando. Esta chica deberá no sólo encontrar la fórmula que le permita ser como era antes, sino también hallar la melodía que le permita salvar a su pueblo de una inundación que amenaza con destruirlo todo.