Anna Maria Percival and Eleanor Percival, sisters-in-law and lovers, travel to the countryside at the request of Mr. Andrew Bennett, whom they meet with upon arrival. Anna Maria and Eleanor front as a musical act, but are actually in the business of monster-hunting—specifically, vampires. And Mr. Bennett suspects that his brother Henry has been turned, based on conversations he once had with James, Anna Maria’s dead husband and another hunter. Anna Maria and Eleanor prepare together for the night, arranging stakes, garlic, crosses, and more. Anna Maria looks at a picture of James with his brother, Alexander. Alexander was also Eleanor’s husband, who unfortunately died around the same time as James. It is revealed that Anna Maria had once been in a polyamorous relationship with both James and Alexander, which Eleanor joined an unspecified length of time later.

That night, Anna Maria exchanges niceties with guests of the Bennett family, then sits down to perform. The songs she sings are spells, and they lull all the guests to sleep—except Henry Bennett, because the songs' effects are resisted by monsters. Henry and Anna Maria tussle for a few moments, eventually ending with her stabbing a stake through his heart, killing him. Suddenly, Mrs. Dickinson, another guest at the household, approaches Anna Maria, unaffected by the spell—revealing herself to be a vampire. What's worse, she takes pride in having been a part of the nest that killed both James and Alexander. They fight, and Anna Maria ultimately kills her as well. She and Eleanor clean up all evidence of their hunting and awaken the oblivious household. A few days later, they head back to London.