Mouse journalist Geronimo Stilton sets out in a hot-air balloon to find a legendary island covered in silver only to be attacked by a ship of pirate cats.

Oh, what a day! I had just published New Mouse City's first phone book -- and almost every single number was wrong! My customers were out for my fur. So when Thea, Trap, and Benjamin asked me to join their quest for a legendary island covered in silver, I agreed. But no sooner had we set out than we were attacked by a ship of pirate cats! They mousenapped us and threatened to make us their dinner. Would we escape with our lives ... or find ourselves...