Juliana Crain makes a new acquaintance in the Neutral Zone - an Irish fixer named Wyatt - and soon finds herself on the run and seeking Tagomi's aid. The Japanese test an atomic bomb. Joe Blake is sent on a diplomatic mission to San Francisco. Kido hires a new sergeant. Nicole Dormer arrives in New York to head a new propaganda campaign. The Smiths struggle with the aftermath of Thomas' death.

Juliana and Tagomi pursue the mysteries of the films and Juliana reunites with an old friend. Childan is anxious to return to San Francisco now that the reprisals have stopped, but a potential new romance makes Ed reluctant to leave. Kido receives intelligence that sets him on a new path. Smith finds himself celebrated by Nazi high society at a screening of Nicole's new film about Thomas.

With Wyatt's aid, Juliana flees San Francisco with the stolen Nazi secrets. Childan can finally return home; Ed decides to stay in the Neutral Zone. Tagomi makes revelations to Kido that change Kido's perspective. John Smith's career takes a turn.

Juliana embarks on a mission to stop the Nazis - a mission that reunites her with old friends. Thelma and Nicole grow closer, despite the risks. Smith learns more about the Nazis' efforts into alt-world travel. Kido demands Tagomi come clean about the films and his ability to travel. Kido coaxes crucial intelligence from Childan.

Juliana's attempt to stop the Nazis lands her in a precarious position. Himmler and John Smith lead a lavish celebration of Year Zero. Amid a series of successes, Smith faces a setback. Kido returns to San Francisco with a prize, performs an act of kindness for a friend. Tagomi makes a difficult decision. Ed returns to San Francisco and reconnects with Childan.

John Smith receives key intelligence from his officers at the Die Nebenwelt complex, while back at home he struggles with the changing dynamics of his family. Bell Mallory and the BCR join forces with Wyatt Price’s rebels. Kido tries to bond with his estranged son, Toru. Childan makes a connection with his Japanese assistant. Juliana discovers an enemy in one world can be a friend in another.