Geronimo Stilton's ancient ancestor Geronimo Stiltonoot is back in another prehistoric adventure. It's the night of the big Cavemouse Idol competition, but Geronimo Stiltonoot isn't there. He has a cold, and goes to bed early. So when it's discovered that the contest's valuable grand prize has been stolen, Geronimo is the main suspect. He must prove his innocence, or end up in enormouse trouble.

"New Mouse City was in a panic. A strange epidemic had broken out --mice everywhere were covered in weird blue spots. Mouse Island's most famouse doctor immediately set to work with his team to try to find the cure--but someone was trying to stop him. Could I figure out who before I ended up blue myself?"--Page 4 of cover.

"Bart Barnacle, the prehistoric pirate who has been visiting the cavemice, is ready to return to his pirate island home. It's so far away that the Stiltonoots offer to accompany him on the long, treacherous journey over the sea. On the way, they encounter megalithic danger and hungry sea monsters"--Page 4 of cover.

"My family and I traveled to Milan, Italy, for a special event: the unveiling of the precious ancient parchment containing the secret, original recipe for panettone, a traditional sweet holiday bread. But right before the big moment, the recipe was stolen. And the thief was masquerading as--me. Could I catch the thief and clear my name?"--Back cover.

"Geronimo Stiltonoot and The Stone Gazette are in the running for the Stone Age Ratitzer: the award for the best prehistoric journalism! But their main competition is Sally Rockmousen, the ruthless host of Gossip Radio -- and she'll stop at nothing to win. Can Geronimo sniff out a scoop in time to defeat her?"--Back cover.

Geronimo Stilton takes MouseStar 1's broken computer to a distant planet to be repaired by a brilliant inventor, but pirate spacecats attack and steal the device, and the spacemice must retrieve it before the machine can be turned against them.

When Space mouse Geronimo Stilton helps an alien spacecraft get back to its home planet, their queen becomes enchanted by Geronimo, and tries to force him to marry her and stay on the planet Flurkon forever.

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?

Friends of the spacemice have disappeared on a strange ice planet, Polarix. Geronimo Stiltonix and his crew are called to search for them. When the spacemice arrive on Polarix, they're surprised at the inhabitants--cute little aliens that look like colorful fuzz balls. But are these creatures as harmless as they look?

On his way to the Grand Masked Ball and what promises to be a disaster of a date, Geronimo's once again whisked away to the Kingdom of Fantasy where he must save the Princess of the Vanilla Fairies from an evil wizard who's using the pirate ship, Ship of Secrets, to gather magical objects to increase his power and take over the kingdom.