When he begins receiving packages containing useless things he did not order, Geronimo Stilton discovers that someone on the Internet has stolen his identity, a dilemma that compels him to enlist the help of computer expert Professor Margo Bitmouse, who helps Geronimo track down the hacker.

"When you're with Geronimo Stilton, it's always a fabumouse adventure! Trap had finally talked me into taking a relaxing vacation. But it turned out it wouldn't just be given to me. We were going to have to win it! I was on my way to Port Stinky to win a race against the wild. Could I stand the smell long enough to win?"--

It's the grand opening of Traps new superstore, but nothing is working. The lights won't turn on, the doors won't open, and the loudspeaker is broken. Geronimo must figure out who is trying to sabotage the grand opening.

When you're with me, Geronimo Stilton, it's always a fabu-mouse adventure! Sally Ratmousen broke some shocking news: The Rodent's Gazette was out of money and in danger of closing. Then Grandfather William broke even worse news to me: I needed to sell my comfy, cozy house in order to save our paper! How terrible! But could I sell it -- and find a new home -- in time to help?

It's the start of an exciting cavemice contest: a race to Boulder Bay and back! It's a dangerous route, but it will supply the village cheese maker with rare hot lava peppers, and there's a big cash prize. Trap teams up with Geronimo -- who has a lazy, slow, city autosaurus (the cavemice mode of transportation). Can they reach the finish line without going extinct on the way?

Once again Geronimo is summoned to the Kingdom of Fantasy, and this time he must rescue five princesses of The Kingdom of Lotus Flowers who have been kidnapped by a terrible witch--but first he must journey to the Island of Dragons to find the bravest, the wisest, the silliest, and wittiest, and the most sincere dragons who prophecy says will aid him in his mission.

The enchanted Winged Ring which Queen Blossom gave to Geronimo is missing, apparently stolen by the dark fairy Wither and her dark crow allies, and whoever possesses it gains enormous power and can travel between the Kingdom of Fantasy and the real world--now nightmares are starting to affect Mouse Island, the entire Kingdom is furious with Geronimo, and it is up to one mouse to set things straight and recover the ring.

The Harmony Stone has been stolen from the Crystal Castle, and without it the Kingdom of Fantasy is vulnerable to an ancient enemy, The Invisible Army; Geronimo, together with Queen Blossom's daughter, Winglet, embarks on a mission to find the ancient crown which will defeat the Invisible Army and restore harmony to the empire--but they must make it back to the Crystal Castle before it is overwhelmed by the enemy.

Geronimo Stilton's ancient ancestor Geronimo Stiltonoot is back in another prehistoric adventure. Geronimo Stiltonoot and his family are off to find a cure for Grandma Ratrock's aches and pains. She's heard that a remedy hides in a legendary valley, and Geronimo isn't even sure it exists. Little does he know that getting there will be an adventure among geysers, volcanoes, and rivers of molten lava.

"Fairies, dragons, wizards, and more await Geronimo on every magical Kingdom of Fantasy adventure! For the first time ever the magic of the Kingdom of Fantasy reaches the streets of New Mouse City!"--