Shipwrecked - Carey Fessler

The trek has begun, and the trail will show no mercy. 

After escaping a rogue submarine, twelve-year-old cousins Emma and Scott wash ashore on the beach of a remote tropical island lurking with jungle dragons and headhunters. 

So begins their trek to find safety and civilization so they can return home to their families in Australia. But not before having to fight for their lives across a savage land. Can the young castaways survive long enough to find help?