Velma discovers she's inherited her great-great-uncles' cursed castle in Transylvania, Pennsylvania. The team decide to go there on a spooky adventure.

Vampire sisters Silvania and Daka try to rescue their baby brother, a half-vampire, from the clutches of the evil vampire queen Antanasia, who wants to crown him as her heir.

Keeping secrets can be difficult, especially when you’re a twelve-year-old half-vampire moving from Transylvania to a new life in Germany. Going to school, making new friends and fitting in — it’s all tough when you can’t just be yourself. With a vampire father and a human mother, sisters Dakaria (Daka) and Silvania don’t live in your typical blended family. Each girl embraces a different side of her genetic makeup: Daka wishes she was 100% vampire; Silvania wishes she was 100% human; and both believe they can finally realize their hearts’ desires when the opportunity to change presents itself. Will Daka and Silvania realize that, sometimes, your uniqueness is your greatest strength?