Mako is a boy who lives on the island of Bora Bora with his pet dog Afa, his mother , and his grandfather. Mako is great with his hands.
Tupa is terrorizing the Village of Bora Bora, and acts as if it owns the lagoon.
Mako has gone to a nearby island to pick up oranges and bananas for his Mother. Mako hopes to see tupa to avenge his fathers deaths and gain the King's bounty for Tupa's head.
Mako is going back home to his village, while he spots a white fin he has not seen before on his usual trips. He realizes tupa is here, and his hands get shaky. Meanwhile Afa is barking and tipping the canoe, and falls of leaving him paddling to the shore
Mako fights tupa in hope of killing him. Mako kills tupa, just as he has practiced on his coral tupa, by spearing him through his eyes .
Mako brings tupa's corpse back to the island, to claim the kings rewards for slaying tupa The ghost of the lagoon.