Book 1


Book 1

Thea Stilton and her journalism class try to find a missing student.

Book 2

An Adventure Down Under!Mouldy mozzarella!
A flock of sheep at Nicky's family's Australian ranch was losing all
its wool and no-one knew why. Nick and her friends, the Thea Sisters,
headed to Australia and set off on a tour of the whole country in search
of clues. What happened next turned out to be a truly remarkable
outback adventure!Meet the Thea Sisters!Nicky is always in a good mood when she's outdoors.Colette is energetic and full of great ideas.Pamela is a peacemaker who can't stand arguments.Paulina loves travelling and helping other rodents.Violet is detail-oriented and always open to new things.

Book 2

Thea Stilton and the Thea Sisters are on an expedition to the fantastical Land of Erin! While they are searching for a missing mouse, they learn that the land is in peril. On their journey, the mouselets encounter fairies, pixies, gnomes, and other magical creatures -- some helpful, but some out to trick them! Can they complete their mission and save the Land of Erin before it's too late?

Book 3


Book 4

The Thea sisters have received an urgent message from their friend Will Mystery saying that the magical land of the clouds is in danger and the mouselets must find out why the clouds are disappearing.

Book 4

Where is the Secret City?When
Paulina gets a phone call from home telling her that a friend is missing
the Thea Sisters travel to Peru to help solve the mystery. There, the
five mice climb the Andes Mountains in search of a missing
archaeologist. Along the way, they stumble upon clues leading them to a
mysterious hidden city. Will the Thea Sisters find Paulina’s friend -
and the treasure of the Secret City?Meet the Thea Sisters!Nicky is always in a good mood when she's outdoors.Colette is energetic and full of great ideas.Pamela is a peacemaker who can't stand arguments.Paulina loves travelling and helping other rodents.Violet is detail-oriented and always open to new things.

Book 5

Thea Stilton and the Thea Sisters are needed to help Aquamarina, the magical land of the ocean! The enchanted Music of the Sea has stopped playing, and no one knows why. If it doesn't return soon, the realm will perish!

The mouselets and their friend Will Mystery travel to the underwater world to find the magical music. On their mission, they swim through dangerous waters, encounter strange and fantastical creatures, and even reveal an ancient mystery. It's a mousetastic aquatic adventure!

Book 6


Book 7

The Thea Sisters are just about to head off on their separate family vacations when they receive a call from Will Mystery. Once again, there is trouble in one of the imaginary kingdoms! A crack has been discovered in one of the maps in the Hall of Roses.

The girls head to the Crystal Kingdom to help uncover the mystery. There, they find that a dragon has been wreaking havoc all over the land. He has been turning all of their precious gems into stone and leaving a path of destruction wherever he goes. The sisters figure out why and help break the spell.

Book 8


Book 9

The Thea Sisters are summoned to the Seven Roses Unit by Will Mystery, but when they get there Will is missing! The sisters must follow a trail of clues to the Fantasy Kingdoms on their quest to find Will.

Book 11


Book 13


Book 14


Book 15


Book 18


Book 19

It is up to the Thea Sisters to investigate when an Ecuadorian chocolate factory known for its environmental practices begins malfunctioning and the owner suspects sabotage.

Book 21


Book 22

Thea and the Tropical Treasure

by Thea Stilton

Published 24 November 2015