Geronimo Stilton #18 (Geronimo Stilton)

Scholastic Paperbacks (Apr 1, 2005)
Paperback – 128 pages
ISBN: 0439691419 / 9780439691413
My sister had come up with a new way to torment me. She'd combined my two least favorite things - travel and ghosts! Thea had heard rumors of a haunted pirate treasure buried on a desert island. And before I could say "avast ye scurvy rats," she'd dragged me into her treasure hunt!