Five years after giving up his powers and separating from his friends, Leo San Juan has started a new life trying to focus on his family and their bakery, staying away from danger and adventures. However, Leo knows that his plans are rarely fulfilled and this time is no exception: while traveling with Nando to Veracruz, things start to get weird, and from the depths of the Tuxtlas jungle, an ancient curse has returned and only Leo can face it.
When a human baby crosses the Eternal Mirror, the portal between the living and the dead opens its path to the beings from the underworld.
After releasing the Chupacabras, Leo San Juan decides that it is time to return together with his brother Nando to his grandmother's house. Halfway down the road, Charro Negro manages to confuse Leo and because of him, an innocent girl is dragged into the underworld. Leo is forced to repair the damage. His friends will come to try to help him and get out of there as soon as possible. But it is no coincidence that the Charro has chosen to involve Leo, his intentions go beyond getting a new soul.