I, Geronimo Stilton, found myself traveling through time once again! While testing his latest time machine, Professor von Volt accidently brought some history into the present. Tops, our triceratops friend, Helen of Troy, Attila the Hun, Charlemagne, and Christopher Columbus were all in present day New Mouse City! My friends and I climb into the new time machine to take them back in time. But we aren't sure the new machine works perfectly! Can we...

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.

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.

Drawn once again into the Kingdom of Fantasy, Geronimo discovers that the Land of Books is being threatened by a wave of grayness spreading from the Kingdom of Swamp Valley rotting books and turning all the characters gray, sad and worried--and it will be up to Geronimo, Winglet (daughter of Blossom and newly crowned empress), and the intrepid characters from fiction who join them along the way, to locate the source of this new evil and put a stop...