How far will they go to rescue the ones they love?

Esmerelda and Freddy have spent lifetimes trying to find the prison of the demon Don Marcos so they can break the curse and find Freddy's lost love. Everything seems to be lining up, but Don Marcos's prison slips through their fingers yet again. When a new demon rises to take his place, they must trust their friends with the truth and hope they can end this curse.

Meanwhile, Diego and Alex are attacked by a wolf-like beast that no one wants to admit knowing about. Determined to get to the truth and stop the Big Bad Wolf from getting to Alex, Diego heads out into the city as Shadow Guardian. With Alex watching his back in the command center, Diego will stop at nothing to stop this threat to his community—and his boyfriend.