Werewolves and vampire been each other's enemies for centuries but the half vampire mateo who's a son of a human and vampire befriend a werewolf lia but a evil vampire Magnus fought the werewolves to kidnapped lia but then Lia and her family moved away and fifteen years later Mateo has a adopted sister olivia or olive for short and then Mateo meets with lia who haven't seen in fifteen years but their meeting was appeasement