Geronimo Stilton Books #22: The Secret of Cacklefur Castle & #24: Field Trip to Niagara Falls

"My old friend Creepella von Cacklefur invited me to her family's spooky castle. And before I could say 'not for all the cheese in Cheddarton,' she'd mousenapped me! And holey cheese, what an adventure! I was off to Niagara Falls on a field trip with my nephew Benjamin's class. I was surrounded by mischievous young mouselets who seemed determined to send me over the Falls in a barrel!" ?Geronimo Stilton