When sharks take a bite out of their catch, Casey and Jeff must adapt their fishing strategy to outsmart Oahu's apex predators. As Josh returns to help, a visit with an old friend of his father's inspires a bold idea to bring the Cornelia Marie to Hawaii.

With the Cornelia Marie as their mothership, Josh, Casey and Jeff cast lines into Hawaii's most productive offshore fishing spot. When ocean currents dash hopes of a quick bounty, they must apply lessons from the Bering Sea to land the elusive ahi horde.