Barbara Pellizzari

A lion cub is kidnapped while the Thea Sisters visit a Kenyan safari, and they must travel across the savanna to rescue him.

When Paulina, one of the Thea Sisters, finds a strange blue-skinned boy unconscious on the beach, the sisters set out to solve the mystery of who the boy is and where he comes from--and how to return him to his home.

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 off to Madagascar for Adventure Camp. While on the nature preserve, they discover that endangered animals are under threat.

While on vacation in the Bahamas, the Thea sisters stumble across an old pirate map and endeavor to find the treasure, unaware that someone else is also seeking the prize.

While Violet is taking an art class in Holland, her friends' father turns up missing, and his disappeance seems to be linked to a mysterious black tulip.

For the first time ever, Mouseford Academy is offering a course in outdoor survival skills, and it's being taught by the athletic adventurous Bruce Hyena! All five Thea Sisters sign up, along with the Ruby Crew. But when a terrible storm hits during the two-day outdoor challenge, there are mouselets in danger! Who will come to the rescue? -- Back cover.

There is a crisis in the Starlight Kingdom, one of the fantasy worlds: its stars, powered by a special kind of stardust, are fading and may soon go out forever, leaving the Kingdom in darkness--so the Thea sisters and Will Mystery set out for Brightstar Castle to discover what is wrong, but first they must overcome the obstacles and challenges that the fairies are placing in their way.

When Thea 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.