Jack Escarcha: El final es el principio is the fifth and final book in the Guardians of Childhood (Los Guardianes de la Infancia) series by William Joyce

Los Guardianes se enfrentan a un desafío que pone en riesgo la esperanza de los niños, obligando a Jack a asumir su verdadero potencial.

Arturo Peral is credited as a co-author on the Spanish edition, indicating his significant role in the book's translation and adaptation. This collaboration goes beyond mere translation, as Peral helps adapt Joyce's rich narrative for a Spanish-speaking audience while remaining faithful to the original story's tone and spirit.