Bianca, a skilled vampire hunter, is tasked with posing as a bride to kill Elijah, a millennia-old vampire. To achieve her goal, she must make him fall in love and weaken his heart. Initially, Bianca believes Elijah to be an evil creature, but upon getting to know him, she discovers his purity rivals that of humans. As Bianca gets closer to Elijah, she starts to develop feelings for him, which complicates her mission.