In The Secret of The Fairies, the Thea Sisters reach to the beautiful land of Erin. Their companion goes missing there and they discover that the ground is in some danger. There they were trying to save the lands, many fairies, gnomes and other magical creatures come in their path. Some of them become pleasant and supportive to them, while others make more trouble. He writes down his experiences of journey in his personal autobiographical series and Thea Stilton is youngest sister of him. So the story has an amazing plot and beautiful descriptions.