It's Cara and Freddy's birthday and the two siblings try to look for their birthday presents while their parents aren't home. Cara and Freddy discover an underground chamber beneath their attic and they encounter a vampire named Count Nightwing and a young girl named Gwendolyn. The siblings learn that Gwendolyn is not what she seems and the two leave the chamber, only to run into their parents who have returned home. The mother happily reunites with her father, Count Nightwing and she reveals that the vampire is their maternal grandfather. An even more bigger surprise comes for Cara and Freddy when they learn that they are vampires like their parents and grandfather, the two siblings get their birthday present which is bunk beds made of coffins, Cara and Freddy begin to embrace their vampire heritage.
—dawsonpersi