"An adventure down under! Moldy mozzarella! A flock of sheep at Nicky's family's Australian ranch was losing all its wool, and no one knew why. Nicky and her friends the Thea Sisters headed to Australia and set off on a tour of the whole country in serch of clues. What happened next turned out to be a truly memorable outback adventure!" -- P.  of cover.
Thea's friends the Thea Sisters head to Peru, where a good friend of Paulina's is missing. There, the five mice climb the Andes mountains in search of a mysterious treasure that's hidden in the Secret City of the Incas. Readers will love following the clues to help the Thea Sisters solve the mystery!
"In this exciting adventure, the Thea Sisters are off to Paris to visit Colette's fashion-designer friend Julie. But when Julie's designs are suddenly stolen, the girls must search the city of Paris to catch the thief and save the fashion show."--Amazon.com.
The Thea sisters are off to Japan on a cultural exchange program. While they're busy exploring Kyoto and admiring the beautiful cherry blossoms, a valuable item is stolen from their friend Kumi's family. Will the five mice be able to catch the thief?
The mouselings are headed on a fabumouse mission-- to the moon! After much preparation, the mice blast off. But when they arrive at their lunar vacation spot, things start to go wrong, including spaceship wrecks and rebellious robots. Can the Thea Sisters save the day?
"The Thea Sisters travel to New York to cheer for Nicky as she runs the Big Apple Marathon. While there, they visit Pamela's family and have a delicious dinner at the family's pizzeria. But when someone threatens to burn the restaurant down, can the Thea Sisters catch the troublemaker and solve the mystery?"--P.  of cover.
"In this fabumouse adventure, the Thea Sisters head to Alaska, where they're attending a conference held by an important ecological association. Their host and his family are native Alaskans, who show the mouselings their favorite games and activities. But soon there's trouble - the Thea Sisters discover that someone is upsetting the ecosystem by blowing up the ice with explosives! Can the Thea Sisters figure out what's going on and save the day?"--Publisher...
"When the Thea Sisters' friend Bridget returns to Scotland for a family emergency, the five mice offer to help. And when Bridget goes missing, they have to rush to Scotland to find her! Along the way, the Thea Sisters encounter Celtic legends, cryptic messages, and hidden treasures on a trip that's full of surprises!"--P.  of cover.
The Thea sisters have been invited to Egypt to participate in an archeological excavation searching for the lost Treasure of the Sun. However, they discover that theives are also after the lost treasure.
"When the Thea Sisters' friend Ashvin is in trouble, they rush to his aid--in India. Ashvin has been working to return the monkeys living in the big city to their natural jungle environment. But the monkeys have suddenly started stealing jewels. Can the Thea Sisters figure out who is behind this terrible theft?"--P.  of cover.
"The Thea Sisters are boarding the famouse Orient Express for a journey from Paris to Istanbul! The train is on a special trip to return a precious wedding dress stolen years ago from an Istanbul museum. But there's a rumor that the mysterious Acrobat Thief will steal the dress from the moving train! The Thea Sisters are determined to foil this super-sneaky mouse's plans."--Amazon.com.
"The Thea Sisters are headed to Italy for a ballet competition! But the mouselets aren't just there to dance -- they are there to investigate. A group is plotting to rig the prestigious contest, and the future of their new friend -- an aspiring ballerina -- is at stake! Can the Thea Sisters stop this scheme before it's too late?"--P.  of cover.
"The Thea Sisters are in Hawaii to compete in an international hula festival. The mouselets are having a great time -- until they learn that the festival is located on the side of a volcano that is about to erupt! No one else seems know about the danger. The Thea Sisters don't have any time to lose!"--Page 4 of cover.
"The Thea Sisters are visiting a friend in Ecuador who has a sweet job--he runs a chocolate factory. His factory is in the running for a major award for its environmental methods. But suddenly, chocolate production starts to malfunction. Is it sabotage?"--Amazon.com.
" While on vacation in Greece, the Thea Sisters make friends with a company of actors who are rehearsing for a play that's about to open. When an actress sprains her ankle, Colette ends up standing in for her! But suddenly, right before the performance, the lead actor goes missing. Can the mouselets find him in time for the show to go on?" --
When one of the Thea Sisters' favorite mystery writers goes missing, the five mice travel to the author's native Iceland, where they reconstruct the dangerous plot of his latest novel in the icy terrain to piece together clues.
While the Thea sisters are at the excavation site of a dig at Hierapolis, Professor Brenninger unearths a series of priceless and very old figurines, but the Thea Sisters think the discovery may be a scam and investigate.
"The Thea Sisters are invited to the Festival of Time in Germany! They arrive in the Black Forest and find that a famouse clock has been stolen. The mouselets are on the case. Can they find the thief and return the clock before time runs out?"--
Taking a road trip to San Jose along Route 66 while stopping in Chicago, St. Louis, and other iconic cities, the Thea Sisters are dismayed to learn that an unknown saboteur has wiped a special video game project off of a programmer friend's computer.