The Thea sisters are five fun, lively students at Mouseford Academy on Whale Island, who want to be real, live journalists. Between classes and friendships, love and small fits of jealousy, they find life at the Academy to be a never-ending adventure!

The Thea Sisters are five fun, lively students at Ratford College on Whale Island, who want to be real, live journalists just like their hero, Thea Stilton. Between classes and friendships, love and small fits of jealousy, they're finding college life is really exciting! It's the start of the new school year and the students have arrived at Ratford College. Every year at this time, the whales move off the coast of Whale Island, but this time, a savage...

Mouseford Academy is about to get rocked…with the arrival of the pop-sensation 6 Seconds of Spring! Now the stage is set for a talent contest where the students must perform in front of their celebrity judges. Thea Sisters Nicky, Paulina, Violet, Pamela, and Colette prepare their own song, but when they hear their shy friend Dina display her hidden talent for signing and song writing they know the overall concert will be a success. But as Dina takes...

Thea Stilton sends Colette, Paulina, Violet, Pamela, and Nicky on a school project exploring in and around Whale Island in search of treasure. When a bad storm interrupts their scavenger hunt, separated, the Thea Sisters must rely on their individual knowledge and skills to make it through the storm and realize the true treasure is being themselves!

During a hot-air balloon flight, the Thea Sisters discover that the turtles have vanished from Turtle Island! If that wasn't alarming enough, dangerous drums of a strange oil are spotted off the shore of the island-a disaster waiting to happen! The Thea Sisters are surprised that none other than Vissa De Vissen wants to help them save the island and the turtles! All seems lost until Nicky and Paulina spot a couple of turtles entering a mysterious...

Everyone is talking about Windy Island's new surf center, even Nicky's hero, Australian surf champion Gary Moon! The artificial reef is supposed to create perfect waves. But the Thea Sisters have discovered a dangerous secret: even a surf champion can't face these giant waves! it's up to them to break the story before another reef is built off the shore of their beloved Donkey Beach.

While attending the Cuckoo Clock Carnival in Germany, the Thea sisters investigate the theft of a famous clock.

The Thea Sisters help their friend Beatrice get ready for the Summer Olympics.

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.

When auditions for a musical at Mouseford Academy are announced, the Thea Sisters all want a role, but Ruby Flashyfur is causing problems.