The ghost of Adelina and Alejandro's Grandma returns one night to say good-bye, and to offer them a message: be careful. Their family has a secret, one that they need to figure out. One that might try to kill them. Lucky for them, their Grandma was one-step ahead. She called in a favour to an old friend, a good friend, a dark friend. He is Adelina's guide, safety net, and saviour. But He might also be apart of their deadly history. He might be the reason they are in danger. Alejandro and the Dark Guardian stand on opposite sides. But who will Adelina choose to side with? Is their even a good side after discovering the family secret?