Scooby-Doo and Shaggy crept cautiously towards the imposing structure, their footsteps echoing in the stillness. "Like, I don't know about this, Scoob. This place gives me the creeps!"

Standing in the center, Mavis Dracula, a young vampire with a mischievous smile, greeted them with a nod. "Welcome to my home! I hear you've been investigating some spooky happenings," she said, her voice echoing off the cavernous ceiling.

Scooby-Doo sniffed curiously at a large, ornate book on a pedestal, his tail wagging nervously. "Ruh-roh, Shaggy! This looks like ghost business!"

Shaggy clung to Scooby as they backed away, eyes wide with fear. Mavis stepped forward, her expression resolute. "We have to stop this ghost before it wreaks more havoc. Are you with me?"

Mavis turned to her new friends, a grateful smile spreading across her face. "Thank you, both of you. I couldn't have done it without your help," she said, her eyes twinkling with relief.

Shaggy chuckled, patting Scooby on the back. "Like, that was one crazy adventure, but I'm glad we made a new friend," he said. "Reah, me too!" Scooby-Doo barked happily, wagging his tail. Mavis nodded, her smile as bright as the morning sun. "And you're welcome here anytime," she added warmly, as they began their journey back down the path, the castle fading into the background.