Juliana Crain is on a mission to take down Reichsmarschall Smith, as the Nazis use the Die Nebenwelt Portal to infiltrate other worlds. Helen Smith struggles to protect her fractured family. Chief Inspector Kido is caught between the Imperial Army and the Royal Family as the Japanese Empire faces its greatest challenge. Amid these tensions, a new rebel force rises: the Black Communist Resistance.

Juliana uncovers a dangerous Nazi plan for ultimate supremacy. Can she convince others to join her in stopping it? Or is it already too late? Though recently celebrated by Himmler, Smith finds that the dangers to his family continue. As the GNR takes retaliatory measures toward the JPS, tensions rise and Tagomi tries to broker peace. A haunted Kido searches for old enemies.

After giving Joe the film, Juliana is forced to flee the fury of the Resistance while embarking on a new path to save her home from destruction. Joe confronts his absent father in Berlin, who is not as he seems. Smith wrestles with what to do about his ill son. Frank takes a gamble with his life in a bid to save Ed. Tagomi's life is turned upside down by his "travel" to an alternative world.

Some 20 years after that loss, the United States and much of the world has now been split between Japan and Germany, the major hegemonic states. But the tension between these two powers is mounting, and this stress is playing out in the western U.S.