Captain Murakami takes over as skipper of the Azuma Maru, replacing the well-liked former captain. Murakami forces the crew to work harder than they ever have, creating enmity and exhaustion. Just when the ship has taken a huge catch of tuna in its nets, Murakami learns that his ship is the only one in position to rescue the crew of another ship, sinking in a storm. He must choose between saving the catch or saving lives. Either choice may mean his ruin.