After only four months of marriage, Rex and Jesse Bana find themselves in mortal danger again when the Yakuza return to Maui. Only this time the Yakuza's plan is far more sinister than simple revenge against Rex and company. They've returned with a sophisticated whaling fleet to secretly slaughter the humpback whales that gather around Maui to calve and mate. Such illegal whaling would decimate the already endangered Pacific humpback whale population. As Rex defends himself against samurai assassins and Yakuza mercenaries, he finds allies in unusual places. Not all those aboard the whaling factory are willing participants. These conspirators seek not only to end this insanity by attempting to kill the evil cannibal Captain Shu, they warn Rex of his dangers and plead for his assistance. Now Rex has more lives depending on him for salvation. Despite promises to Sheriff Joe Tonono never to kill again, Rex must return to his hunting ways to protect his pregnant wife and save the whales. Yet without the evidence of the Yakuza's intentions, Rex is unable to enlist the help of government agencies. He and his odd mix of fellow defenders are forced to mount their own rescue mission. The Yakuza aren't the only ones with traitors in their midst. As Rex and company attack the whaling factory, Rex faces his worst fears. He may not survive to raise the family he so desperately wants.