When the Thea sisters travel to Hawaii to compete in an international hula festival, they discover the festival is located on the side of a volcano that is about to erupt.
The Thea Sisters are headed to Italy for a ballet competition, but they aren't just there to dance, they are investigating a group plotting to rig the contest, and the future of their new friend is at stake, in chapter-book format.
When Thea Stilton travels to Ireland to search for a missing agent, she finds that the whole fantasy Land of Erin is being threatened by earthquakes, and soon Will Mystery and the Thea sisters follow to help her find the secret of the fairies.
