Shark Wars by Altbacker, EJ. Published by Razorbil,2011, Hardcover

Ever since Gray, Barkley, and their friends defeated Goblin, an infamous great white, at Tuna Run, life in the Big Blue has become murkier than ever for this young shiver of sharks. Food is scarce. Enemies lurk in every shadow. And Gray still doesn't know what has become of his family - of his mother, Sandy, and the rest of his Coral Reef shiver. Everywhere they swim, currents seem to whisper of a growing threat . . . of a shark who will stop at nothing until he has seized control of the entire ocean. Now Gray must train with Takiza Jaelynn Betta vam Delacrest Waveland ka Boom Boom, a wise and mysterious fighting fish who has promised to teach his young apprentice the ways of the ocean and the secret of what it means to be a great warrior. That is, if Gray can learn to believe in himself, find the courage to trust his heart, and grow big enough to fight back!

Gray, Barkley, and the alliance of Rogue, Coral, and AuzyAuzy Shivers have defeated the maniacal emperor Finnivus and his vicious Indi Shiver armada. But Finnivus is still plotting. This is the ruler who feasts on the heads of every shark he conquers, after all. When Finnivus' gangs of soldier fish strike, Gray and his friends endure a loss bigger than any before. And this time there's no one left to tell Gray what to do. He's got to lead the rebels into battle for the ultimate fight of good against evil. The fate of the Big Blue rests with Gray! Shark Wars is Star Wars set underwater, the perfect series for the voracious fans of Warriors, Seekers, and The Guardians of Ga'Hoole!

Shark Wars grows more epic—and addictive—with every book, publishing each season! Peace has finally come to the Big Blue and with it a revelation: Gray is not the last megalodon in the ocean after all. Gray swims deeper into the mystery of his family heritage, uncovering the myth of the megalodons and a legend that goes back to prehistoric times. But when the scheming mako Velenka breaks free from her underwater prison, the peace Gray and Barkley have fought so hard to win is threatened. Shark Wars is Star Wars set underwater—it's a modern-day Warriors for today's hungry readers!

Each new Shark Wars book brings higher stakes—and hungrier sharks! Gray thought he could trust Takiza, the wise yet mysterious betta fish who's been his guide and mentor in the often treacherous depths of the Big Blue. But the news that Takiza was responsible for the death of Gray's father has shaken Gray to his very core. Now Gray is questioning everything he thought he knew. The time to find answers is running short. The prehistores—prehistoric sea monsters long thought to be extinct—are breaking out of the underwater volcano range that has kept them hidden for millennia. Gray, Barkley, and their friends and shivermates must prepare for a war unlike any they've faced before! Shark Wars is Star Wars set underwater—it's a modern-day Warriors for today's voracious readers!

As the first Shark Wars series arc draws to a close, hero Gray unexpectedly finds himself the ruler of the ocean. He's got to make wise decisions in a time of upheaval and isn't sure if he's up to the task! Dangerous prehistores are loose in the Big Blue, and Gray must defeat their evil leader, Grimkahn. But if he is to do that, he and Barkley must first outsmart the sneaky and dangerous frilled shark, Hokuu...