Thea Stilton Books in Order

A mysterious message pulls the Thea Sisters into a quest for Atlantis. Following maps and riddles from land to sea, they uncover a hidden civilization and must protect its secrets from greedy treasure hunters.

Whale Island should feel familiar, but strange events make the Thea Sisters suspect a hidden secret. They explore the island, connect the clues, and uncover the truth behind a mystery close to home.

Invited to teach a journalism course on Mouse Island, Thea uncovers a worrying mystery when a student vanishes. With the Thea Sisters, she follows riddles and secret passages to find the missing mouse before time runs out.

In Australia, the Thea Sisters visit a ranch where sheep are mysteriously losing their wool. The search for answers takes them across the outback, where local knowledge and a few risky clues may save the farm.

A marine biology lesson leads the Thea Sisters to an old map and a shipwreck legend. Their investigation takes them from classroom curiosity to real danger, where a "ghost" story might cover up a very human crime.

The Thea Sisters travel to Paris to visit Colette's fashion-designer friend, Julie. When Julie's sketches are stolen, the girls race through the city to catch the thief and save her big show.

In Peru, the Thea Sisters join an expedition near the Andes and Machu Picchu. When a mouse goes missing, they chase clues through ancient passages and puzzles, hoping to uncover the truth behind a legendary secret city.

New York City is thrilling, but it is also full of trouble. When the Thea Sisters run into a big-city mystery, they chase clues from busy streets to hidden corners of the Big Apple to stop a theft.

In Japan for cherry blossom season, the Thea Sisters expect a dreamy trip. Then a stolen item and a trail of clues turn festivals and sightseeing into a fast-paced hunt to set things right.

In Alaska, the Thea Sisters attend an ecological conference and stay with a local host family. When someone starts blasting the ice with explosives, they must uncover the saboteur before the ecosystem is damaged for good.

A trip focused on the night sky turns tricky when the Thea Sisters get separated from their group. Working together, they follow the trail, solve the mystery behind the mishap, and find their way back.

A dance competition is coming up, and the pressure is on at Mouseford Academy. When suspicious problems threaten the event, the Thea Sisters investigate to keep the challenge fair and fun.

At Mouseford Academy, the Thea Sisters get swept into drama around a big school performance. When something important goes wrong, they investigate the backstage chaos and learn what teamwork really looks like.

A school trip turns tense when the Thea Sisters find themselves in real trouble. With quick thinking and brave teamwork, they follow the safest path out and uncover what caused the danger in the first place.

A missing diary causes trouble at Mouseford Academy, and the Thea Sisters can tell someone is hiding the truth. They follow small clues and big feelings to find the diary and clear the air.

The Thea Sisters stumble into the realm of the fairies, where missing magic threatens the balance of the land. To set things right, they solve an old riddle and outsmart someone who wants fairy power.

In Egypt, a rare blue scarab and an archaeological mystery draw the Thea Sisters into trouble. With thieves close behind, they follow clues from ancient sites to crowded streets to protect a priceless discovery.

The Thea Sisters board the Orient Express from Paris to Istanbul to return a priceless wedding dress to a museum. With VIPs onboard and rumors of the Acrobat Thief, they guard the dress and hunt for the culprit.

When the Thea Sisters visit a royal setting, a famous emerald linked to a young prince goes missing. The girls must unravel the theft quietly, following clues through celebrations and secret corridors.

A visit to an old castle becomes a classic whodunit for the Thea Sisters. Strange noises, hidden rooms, and a missing object push them to uncover the castle's secret before the mystery ruins the trip.

A rival group called the Lizard Club is causing trouble, and the Thea Sisters refuse to back down. As pranks escalate, they investigate who is behind the revenge and protect their school community.

The Thea Sisters head into a frozen adventure where a secret linked to snow puts everyone at risk. Following clues through icy places and old legends, they must solve the mystery before winter wins.

At a major dance event, the Thea Sisters notice a string of strange accidents that could shut everything down. Following shadowy hints backstage and in the crowd, they work to expose the saboteur before the final performance.

On a photo safari in Kenya, the Thea Sisters fall in love with the animals at the reserve. Then a newborn lion cub is kidnapped, and the mouselets race across the savanna to bring the cub home safely.

In Hawaii, the Thea Sisters dive into local traditions and a legend about rare fire flowers. When trouble threatens the celebration, they follow clues across the island to stop a thief and protect what matters.

At a lively festival in Spain, the theft of a precious fan pulls the Thea Sisters into an investigation. Their search leads to a hidden treasure and rival hunters, and they race to solve the mystery first.

A rumor about a castle in the clouds draws the Thea Sisters into a high-flying mystery. To reach the truth, they decode clues, face dizzying obstacles, and uncover what is really hidden inside the Cloud Castle.

An old Viking ship leads the Thea Sisters into a treasure-filled mystery. As they follow history and hidden messages, they race to protect a priceless find from thieves and bring the truth to light.

A trip tied to chocolate turns sour when someone starts sabotaging the sweet side of the event. The Thea Sisters investigate behind the scenes, following clues to protect a reputation and stop the culprit.

In the Netherlands, the Thea Sisters arrive for a famous garden event, only to find a rare tulip has been stolen. The girls follow a trail of clues to catch the thief before the show is ruined.

An ancient legend suddenly feels real when a valuable artifact disappears. The Thea Sisters sort truth from myth as they chase clues through museums and historic sites to recover what was taken.

A musical is coming to Mouseford Academy, and the Thea Sisters throw themselves into rehearsals. When problems start popping up, they investigate the mishaps and keep the show from falling apart.

A trip to the water becomes an adventure when the Thea Sisters set their sights on a giant wave. Between training, nerves, and a new mystery, they must stay focused and support each other in the surf.

An exciting new invention is the talk of Mouseford Academy, until it suddenly disappears. The Thea Sisters investigate the missing prototype, sorting rumors from facts to find the thief behind it.

A legend of a lost sea treasure sends the Thea Sisters on an ocean adventure. With storms, secrets, and rivals close behind, they follow the trail to keep the treasure from falling into the wrong paws.

A bundle of lost letters sparks a mystery that reaches farther than the Thea Sisters expect. Following handwriting, dates, and hidden messages, they work to return the letters and uncover who wanted them to stay lost.

A tropical trip becomes a treasure hunt when the Thea Sisters stumble into a mystery tied to a hidden prize. With rivals on their trail, they follow clues through sun-soaked scenery to find the treasure first.

A skating dream is within reach, until setbacks threaten to knock a friend off the ice. The Thea Sisters dig into what is really happening and help restore confidence before the big moment.

A big fashion moment at Mouseford Academy turns into a mystery when something important goes missing. The Thea Sisters chase clues through sketches, closets, and backstage drama to find the culprit.

Lights and cameras arrive at Mouseford Academy, and everyone wants a role. When a new project runs into strange problems, the Thea Sisters investigate behind the scenes to keep the action rolling.

The Thea Sisters take the stage for a school event, but strange incidents threaten the production. Working together, they hunt down the cause of the chaos and make sure opening night happens.

A mysterious love letter sparks whispers and worry at Mouseford Academy. The Thea Sisters follow the paper trail, decode the clues, and figure out who wrote it before feelings get hurt.

A hidden waterfall becomes the key to a new mystery in the woods. The Thea Sisters follow the trail through twisting paths, uncover who is tampering with the area, and protect the place they love.

The Thea Sisters set sail, expecting a fun trip, until a mystery unfolds on the water. With limited space and plenty of suspects, they follow the clues to solve the case before reaching port.

In Hollywood, the Thea Sisters land near the action, only to discover a hoax threatening a big production. They investigate on sets and in studios, determined to unmask the troublemaker before the cameras roll.

The Thea Sisters head to Madagascar for a wild adventure, and quickly run into trouble that puts animals and people at risk. They track clues through the island's landscapes to stop a scheme before it spreads.

Music takes center stage when the Thea Sisters get involved in a performance that matters to someone they care about. When problems threaten the show, they follow clues and work together to bring the song to life.

A runway event becomes a puzzle when plans start going wrong at the worst possible time. The Thea Sisters investigate the mix-ups, uncover a jealous plot, and help the show go on.

A sea turtle rescue mission pulls the Thea Sisters into an urgent problem near the shore. As they help protect the hatchlings, they uncover clues about what is threatening the turtles and stop it.

The Thea Sisters travel to a land famous for its flowers, only to find rare blooms in danger. Following clues through gardens and hidden paths, they work to protect a place where nature and mystery meet.

A favorite mystery author disappears, and the Thea Sisters head to Iceland to search for him. Using clues from his unfinished story, they follow a dangerous trail across ice and lava to find the truth.

Carnival in Venice should be pure fun, but a masked mystery spoils the party. The Thea Sisters investigate amid costumes and crowds, racing to unmask a thief before the festival ends.

A friendship feels shaky when a mix-up turns classmates against each other. The Thea Sisters use a shared love of food and teamwork to untangle the misunderstanding and rebuild trust.

A puppy needs help, and the Thea Sisters jump in, only to find the situation is more complicated than it looks. As they solve the problem, they uncover a small mystery behind the puppy's trouble.

Excitement builds around a royal-style ball, but a mystery threatens to spoil the night. The Thea Sisters investigate the missing details and last-minute surprises so the celebration can shine as planned.

A secret notebook goes missing, and the Thea Sisters suspect someone is using it to cause trouble. They track the notebook down, decode the notes inside, and learn who wanted the secrets.

In the crystal fairies' realm, something precious is missing and the magic is fading. The Thea Sisters follow riddles and sparkling clues to recover the crystals and keep the fairy world safe.

The Thea Sisters visit Canada for bird-watching and a taste of hockey, until someone in their group goes missing. Their search leads toward Niagara Falls, where they must piece together the clues in time.

At an excavation in Hierapolis, not everyone is happy to have the Thea Sisters around. When a crew member vanishes, the girls follow the riddle of the ruins to find their friend and expose the secret.

In Germany's Black Forest, a Festival of Time is shaken when a famous clock is stolen. The Thea Sisters follow a trail of gears, alibis, and hidden passageways to catch the burglar.

The Thea Sisters arrive in the realm of the star fairies just as a grand dance is in danger. With magic fading and secrets swirling, they follow clues to protect the celebration and stop a dark plan.

Violet is thrilled to play with an orchestra in London for a performance of Romeo and Juliet, until strange events strike backstage. The Thea Sisters investigate the "phantom" behind the trouble before opening night.

A mysterious map draws the Thea Sisters into a treasure hunt full of riddles and secret signs. Racing against rivals, they follow the clues across landmarks and hidden places to reach the prize first.

A friend's Olympic dreams are on the line, and the Thea Sisters step in to help with training and support. When suspicious setbacks appear, they investigate to protect fair play and keep the race for gold honest.

A strange compass points the Thea Sisters toward the next step in a treasure hunt. Following starry hints and coded messages, they race through puzzles and traps to keep the trail alive.

A portal to the Kingdom of Fairies opens, and the Thea Sisters step into a world of magic and danger. When thieves target the Fairy Queen's Magic Mirror, the girls race to protect it before it is stolen.

The Thea Sisters travel to Malaysia on a mission to help protect the rainforest. When threats to the forest grow more serious, they follow clues and take action to stop the damage before it is too late.

A holiday in Rome turns into a citywide treasure hunt for the Thea Sisters. Racing through famous sights and archaeological clues, they must solve the riddles before rivals and surprises derail the game.

On a Route 66 road trip, the Thea Sisters cheer on their friend Ali, who is close to turning her project into a video game. When her computer is mysteriously wiped, they must find out who did it and why.

The treasure trail leads into a legendary maze, where every wrong turn has consequences. The Thea Sisters must solve riddles, spot hidden patterns, and outsmart rivals to escape the enchanted labyrinth with the secret in hand.

In Mexico City, the Thea Sisters help their friend Luz with a special art show while learning about monarch butterflies. When her mural goes missing, they race to track it down and uncover who took it.

In New Zealand, the Thea Sisters visit their friend Charlotte and explore a museum in the Valley of Stars. When a rare skeleton called Didi is stolen, they race to recover it and stop the thieves.

A spooky rumor pulls the Thea Sisters into the woods, where eerie signs hint at a "ghost". Following tracks and clues, they discover what is really lurking among the trees before someone gets hurt.