When Nicky and Paulina give up their summer vacation to guard a nest of sea turtle eggs buried in the sand at Turtle Beach, they become the stars of a new nature documentary. But when invasive seaweed threatens the nest, all five Thea Sisters jump into action and mobilize the entire island to help. Can they work together to save the endangered sea turtles?

Geronimo Stilton is the pseudonym of the famous Italian writer Elisabetta Dami. She has written the famous series of books on Geronimo Stilton. She co-owns the Italian based publishing company called Edizioni Piemme. She likes to get all her ideas through her travels to places around the world.