Jack Escarcha : el final es el principio
(Book)

Many years--and an epic battle--have passed since we last saw our Guardians. The battle claimed Sombra's freedom, but it also caused one of the Guardians to change forever. Nightlight, one of Catherine's closest companions, became Jackson Overland Frost or Jack Frost. Over time, various events occur: two world wars and the Great Depression. But a greater evil lurks. All the Guardians have a feeling, especially Jack. And he is the only one who can stop him ... but to do so, he must tell his story, the last in the Guardians saga: the story of how he became Jack Frost.

After Nightlight, a Guardian, transforms into Jack Overland Frost, he is entrusted by Father Time with a great secret, but he must revisit his past if he is to understand the secret and defeat an old enemy who threatens the world with destruction.