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 death opens its path to the beings from the underworld.