In Kaliningrad, Polish spy Ewa goes undercover to gather critical information on a prominent Russian nuclear engineer.

Posing as consul to the Polish embassy in Minsk, Ewa navigates a complex web of professional and personal relationships.

Ewa helps a key target escape, while Lange works to keep his agents safe. In Riga, Tamara searches for answers.

While discord rocks the consulate, Ewa closes in on the mole, and Lange fights for his remaining operatives in the field.