The first "mystery" plants the gang at a vampire's spooky old castle, but the trappings prove to be utterly benign. There's no real estate scam to break. There are no clues to uncover. The gang, even Velma, behave utterly perplexed. They don't even try to solve the mystery. They become carried away with the appearance and assume all is as they see. This is about one hundred-and-eighty degrees away from the central message of Scooby-Doo, Where Are You? Every effect has a cause. Every mystery has rational explanation, and it pays to be a skeptic.