Some help from an unlikely source leads Esther to discover the bacterium's natural combatants; Heyerdahl and Zara bump heads over his plan to save Norway.

Esther works on developing a vaccine but is shocked to learn the bacterium is turning more aggressive; on the verge of death, Charlie is saved at the last minute; PM Heyerdahl's drastic decision forces Ariel to reconsider her loyalty.

Esther is pressured to develop a vaccine against the resiliently mutating bacterium; PM Heyerdahl employs stringent measures to prevent the disease from spreading; Charlie gets progressively sick; Ariel's brother wants her to join him.

Esther approaches a politician for help to reveal the source of the disease; Leo pleads with Esther to leave Bergen before she catches it; Charlie, believed to be infected with the disease, is to be sent away from the farm where he works.

Esther is busy identifying the source of the disease when the bacteria appear in an unlikely place; Charlie runs the risk of being deported; Ariel is assigned her first big job: to write a speech preventing panic from spreading in Bergen.

Charlie manages to enter Norway as a migrant worker with Hope; Ester is busy securing the food supply but Pantogena, the salmon producer, turns out to be uncooperative; Ariel is questioned by Zara, the PM's closest employee.

When a contagious salmon disease breaks out in Norway, Esther Vinter must look after the food supply in the country; Uma, Charlie and their daughter Hope are on the run for a chance at a better life in Norway.