The books:
#1: Lost Treasure of the Emerald Eye (February 2004)
#2: The Curse of the Cheese Pyramid (February 2004)
#3: Cat and Mouse in a Haunted House (February 2004)
#4: I'm Too Fond of My Fur! (February 2004)
#5: Four Mice Deep in the Jungle (March 2004)
#6: Paws Off, Cheddarface! (April 2004)
#7: Red Pizzas for a Blue Count (May 2004)
#8: Attack of the Bandit Cats (June 2004)
#9: A Fabumouse Vacation for Geronimo (July 2004)
#10: All Because of a Cup of Coffee (August 2004)
#11: It's Halloween, You 'Fraidy Mouse! (September 2004)
#12: Merry Christmas, Geronimo! (October 2004)
#13: The Phantom of the Subway (November 2004)
#14: The Temple of the Ruby of Fire (December 2004)
#15: The Mona Mousa Code (January 2005)
#16: A Cheese-Colored Camper (February 2005)
#17: Watch Your Whiskers, Stilton! (March 2005)
#18: Shipwreck on the Pirate Islands (April 2005)
#19: My Name is Stilton, Geronimo Stilton (May 2005)
#20: Surf's Up, Geronimo! (June 2005)
#21: The Wild, Wild West (July 2005)
#22: The Secret of Cacklefur Castle (August 2005)
#23: Valentine's Day Disaster (January 2006)
#24: Field Trip to Niagara Falls (March 2006)
#25: The Search for Sunken Treasure (June 2006)
#26: The Mummy with No Name (August 2006)
#27: The Christmas Toy Factory (October 2006)
#28: Wedding Crasher (January 2007)**
#29: Down and Out Down Under (March 2007)
#30: The Mouse Island Marathon (June 2007)
#31: The Mysterious Cheese Thief (August 2007)
#32: Valley of the Giant Skeletons (January 2008)
#33: Geronimo and the Gold Medal Mystery (April 2008)
#34: Geronimo Stilton, Secret Agent (July 2008)
#35: A Very Merry Christmas (September 2008)
#36: Geronimo's Valentine (January 2009)
#37: The Race Across America (April 2009)
#38: A Fabumouse School Adventure (July 2009)
#39: Singing Sensation (October 2009)
#40: The Karate Mouse (January 2010)
#41: Mighty Mount Kilimanjaro (April 2010)
#42: The Peculiar Pumpkin Thief (July 2010)
#43: I'm Not a Supermouse! (October 2010)
#44: The Giant Diamond Robbery (January 2011)
#45: Save the White Whale! (April 2011)
#46: The Haunted Castle (July 2011)
#47: Run for the Hills, Geronimo! (October 2011)
#48: The Mystery in Venice (January 2012)
Special editions:
A Christmas Tale (October 2005)
Christmas Catastrophe (October 2007)
The Kingdom of Fantasy (October 2009)
The Quest for Paradise: The Return to the Kingdom of Fantasy (October 2010)
The Amazing Voyage: The Third Adventure in the Kingdom of Fantasy (September 2011)
Thea Stilton books:
Thea Stilton and the Dragon's Code (April 2009)
Thea Stilton and the Mountain of Fire (September 2009)
Thea Stilton and the Ghost of the Shipwreck (March 2010)
Thea Stilton and the Secret City (June 2010)
Thea Stilton and the Mystery in Paris (November 2010)
Thea Stilton and the Cherry Blossom Adventure (March 2011)
Thea Stilton and the Star Castaways (June 2011)
Thea Stilton: Big Trouble in the Big Apple (September 2011)
Thea Stilton and the Ice Treasure (December 2011)
Thea Stilton and the Secret of the Old Castle (March 2012)
Creepella von Cacklefur books:
The Thirteen Ghosts (August 2011)
Meet Me in Horrorwood (August 2011)
Ghost Pirate Treasure (February 2012)
Latest Book: #46: The Haunted Castle
Future Books: #47: Run for the Hills, Geronimo!
Hope this helps! Much as you dislike it, check out the link below where i got the information from and for other details. =)