As co-captain Mandy begins her own family, starting over in the land of their ancestors becomes an unexpected journey to rediscover a lost legacy.

Fishing for Kings, Sig discovers a surprise in his gear. Seeing opportunity, he entrusts the 193-foot Stalbas to Jake while he and Mandy pursue a market for a new species of crab. But as Jake's fortunes turn for the better, he starts making his own deals.

Sig and Mandy roll the dice on convincing old-world seafood barons to buy into an unfamiliar crab species but when Jake chases Russian kings far to the North, the Hansens must add a new boat to their Norwegian fleet for a chance at tanking the biomass.

Sig ventures off the beaten path in search of secrets from a fishing legend. When Jake locates relatives, he puts together pieces of his family's past and finds unexpected answers about his own late father. Clark must prove can tank the crab on his own.

After guaranteeing a troll crab delivery backed by king crab, Sig must make good on his deal before the clock runs out. Jake makes peace with his late father's passing while Mandy finds she has an eye for traditional Norwegian cuisine.

Sig makes an ambitious deal for 25 tons of live king crab. As Mandy hits the docks to buy a new boat, Sig and Jake scramble to the Russian line to find the migrating hoard. But when Jake gets a line in his own prop, he must find a diver to save his shaft.

Thousands of pounds short of their million-dollar Norwegian goal, Sig and Jake steam far to the north to fill their tanks with Russian kings; when Clark finds uncertain depths at shore, Mandy captains a new boat.