Thea Stilton / Stilton, Thea

"Mouseford Academy students are taking a special hot-air ballon tour of Whale Island and beyond, but when they pass over Turtle Island, they see a lack of turtles and a whole lot of trash! And for once, the selfish Vissia de Vissen seems worried about this mysterious disappearance too! In order to solve this riddle, Colette, Nicky, Pamela, Paulina, and Violet will have to do the impossible--team up with Vissia de Vissen and her children Vic and Vanilla! Will they be allies--or are they still enemies?"--Back cover.

"When the Thea Sisters compete in a battle of the bands, in hopes of meeting their favorite band Top Direction, they must find their sound, write a song, and identify the saboteur who is trying to ruin their performance"--OCLC.

"Mouseford Academy is planning a spring field trip to the waterfall in the forest but angry bears are chasing people! Something strange is going on--could Vissia de Vissen be up to her nefarious tricks again?"--Back cover.

The Thea Sisters must break the story of another reef being built off the shore of their beloved Donkey Beach.

As the candidates from the Lizard and Gecko student clubs compete in various competitions to determine who will be class president at Mouseford Academy, a mysterious substance is polluting Whale Island's beaches, putting the island and the election both at risk.