Nim loves her island home and the animals she shares it with even while her scientist father is away doing research, but trouble is on the way and a new e-mail friend could be the only one who can help.

In her third gripping adventure, Nim unearths an amazing opalized fossil, but this discovery puts her island in terrible danger. Nim lives on an island with her father, Jack, a marine iguana called Fred, a sea lion called Selkie, and their friend Alex Rover, the adventure writer. Nim's island is the most beautiful place in the world, and she wouldn't live anywhere else. When Jack invites a group of scientists to visit, they bring their children as...