A girl is taken in by Alexander Anderson when she washes up on the shore of Mysterious Island. But what's more mysterious is that she can't remember who she is, how she got there, nothing. Alexander names the girl Stella. For two years she's been with the old explorer, learning about the island and it's animals. But everything changes when Alexander sends out a coded message to his grandson. She has no idea how much of an adventure that she's about to embark on. Especially when the young man shows up with a group of people and changes her world for the better.

Y/n Anderson is the younger sister of Sean Anderson by only 2 years, making her only 15. Sean receives a coded distress signal from an island where none should exist. Knowing that he will not be able to dissuade Sean from tracking the signal to its source, Hank, Sean and Y/n's new stepfather, joins the teens on a quest to the South Pacific. Together with helicopter pilot Gabato and his feisty daughter, Kailani, they set out to find the island and rescue its sole human inhabitant.