Nim lives on an island in the middle of the wide blue sea, with her father, Jack, as well as a marine iguana called Fred, a sea lion called Selkie, a turtle called Chica and a satellite dish for her email. No one else lives quite like Nim, and she wouldn't swap places with anyone. When Jack disappears in his sailing boat and disaster threatens her home, Nim must be braver than she's ever been before. And she needs help from her friends old and new. Nim's new friend Alex Rover flies away without saying goodbye, and Selkie the sea lion is captured by villains from a cruise ship. Nim must risk everything to bring them back. Nim unearths an amazing fossil, but this discovery puts her island in terrible danger. Nim must choose between saving a natural treasure and saving someone's life.