Ruaumoko's Revenge

Ruaumoko is the guardian of the subterranean world and the maker of earthquakes that swallow a ship as well as the characters in this story - cousins Nikki, Jason and Tim.
This is no ordinary ship they find beneath the mountain. It holds the kind of treasure that some white men will die for, and the man the cousins call Binoculars nearly does die while Rifle stalks them all.
Then Ruaumoko moves again, leaving Rifle free and the cousins holding his darkest secrets.
And Nikki finds that Jason isn't quite the nerd she though he was. . .