The vampire king, Vincent, proposes marriage to Evelyn, a werewolf princess. Vincent's mother, Catherine, gives Evelyn lavish gifts as thanks for carrying their bloodline. When other vampires mock Evelyn as a 'mongrel,' Catherine orders them punished harshly. Despite acknowledging the historical enmity between their species, Evelyn tentatively accepts Vincent's proposal on the condition her father agrees. However, she is shocked to learn Vincent already has a son, who is roughly her own age, revealing a significant complication.