Reef of death (signed) [signed] [first edition]

Seventeen-year-old PC can't resist his uncle Cliff's frantic call and is soon aboard a plane to Australia. Within hours of arriving, PC realizes that his uncle has gotten himself into an even more bizarre predicament than usual, and that Cliff is counting on him to unravel the threads of a mystery linking: a missing scuba diver, presumed dead; Maruul, a beautiful Aboriginal girl suffering from amnesia; a strange map based on a legend of a sacred treasure; an erie, seemly deserted ship; and a huge, horrible creature that lurks in the depths beneath the reef. Trying to help the shaken young girl, PC and Cliff return to the reef where Maruul's brother vanished and take up the search for the Aboriginal treasure that will save the people of Maruul's tribe. But someone else is looking for the treasure too -- and when the two groups collide, a lethal game of hide-and-seek is played out beneath the deep and bloody water of the reef.