Geronimo tries to enjoy his seaside vacation even though his hotel is dilapidated.

The search for sunken treasure: Geronimo and his friends set sail to the Ratlapagos Islands to search for a sunken treasure. He soon begins to suspect that they aren't the only ones looking for the treasure. The mummy with no name: Geronimo and friends go to the Egyptian Museum just before Halloween to investigate what seems to be a real live mummy.

Phantom of the subway: When he hears reports of a ghost haunting New Mouse City's subway tunnels, Geronimo sets out to investigate. Temple of the Ruby of Fire: Geronimo, Thea, Trap, Benjamin and Geronimo race against time to find the legendary Ruby of Fire before it falls into the wrong paws.

"It's Halloween, you 'fraidy mouse!" -- It's Halloween on Mouse Island, and it seemed like everyone was out to get me, Geronimo Stilton! My cousin Trap kept pulling scary pranks on me. And then my sister Thea told me I had to write a book about Halloween in less than one day! Before you could say boo, my nephew Benjamin had dragged me to a graveyard to do research. There I met a very spooky mouse who -- yikes! -- tried to lock me up in her coffin!...