Danny Orlis makes friends with a couple of new kids named Tip and Trixie Blanshard. As Danny leads them in exploring the islands, they come across a forest fire that is just starting. They are able to get it put out, but there doesn't seem to be a good explanation for why it started in the first place. A strange accident, being followed and another fire's starting add to the mystery. Will they arrive in time to save the man who started the fires and who is now in danger?