To keep their family businesses afloat, two Gloucester fishing boats band together in their hunt for giant bluefin tuna, battling the rough North Atlantic to land fish that could be worth upwards of $20,000.

Eighteen-year-old Captain Danny Smith Jr. makes his mark on the fleet with a massive tuna, but sparks fly when a veteran twice his age joins the crew. Capt. Johnny Johnson's attempt to attract tuna results in a shark frenzy.

Captain Johnny gets off to a hot start with a jumbo tuna, but everything changes when all fishing is shut down. To make up for lost time, the Subdivider and Julia Nicole gamble on new grounds.

A perfect storm hits Gloucester, pitting man versus nature as Captains Johnny Johnson Jr. and Danny Jr. hunt for a final score. With time running out, Danny Jr. lands a jumbo tuna that may save his family's season.