In the heart of Transylvania, estranged twins Caroline and Cody reunite under inauspicious conditions at an ancestral home where their hosts disclose the secret behind their family's lineage as Sentinels dating.

Ancient texts reveal to Abe and Izabela important information relating to their current predicament. Caroline and Cody embark on a risky mission, but time is of the essence, as the demon-witch, Elizabeth Bathory, is regaining her strength.

After their close encounter, Abe imparts to Caroline the true extent of the danger they are in, as Bathory and her minions of The Tarnished are bent on extinguishing the Van Helsing bloodline. Izabela discovers Skip has not been truthful.

Skip comes clean about his abilities and his purpose, causing a shocked Caroline to retreat into the forest. Abe believes that it is time for the group to train for the biggest fight of their lives, but Bathory appears poised to act first.

Upon descending on the Powell House with her ghouls Bathory successfully captures Caroline. The rest of the group retreat to safety with Izabela's cousins where time to reflect gives Abe and Izabela insight into Bathory's horrifying plans.

As Bathory and Andrei prepare to bring Dracula back from the dead using the ancient revival relic and the darkest of black magic, Abe, Cody, Skip, and Elena enter the opera house with the goal of vanquishing Bathory once and for all.