Thea Stilton Graphic Novels 6 by Stilton Thea Stilton Thea
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 underground cave
There are mysteries within mysteries but the Thea Sisters are determined to solve them all and save the day.