Jack Escarcha: El final es el principio is the fifth and final book in the The Guardians of Childhood series (known in Spanish as Los Guardianes de la Infancia William Joyce Universidad Pontificia Comillas Book Overview Los Guardianes de la Infancia Release Date: February 2020 (Spanish edition). Publisher: Editorial Bambú Approximately 408 pages. The story follows the transformation of Nightlight into Jackson Overland Frost