Jack travels to Vienna to track down the source of his original intelligence on Sokol. Greer advises Alena on a key NATO deal. Petr Kovac, Alena’s father, hosts a hunt in the Czech woods.

In Budapest, Jack and Mike plan a sting on a slippery arms dealer to ascertain the whereabouts of the Sokol nuclear device, as Greer discovers some intriguing and potentially incriminating information on Petr Kovac.

Jack and Mike head to a mysterious, abandoned outpost in Russia to seize the Sokol nuclear device, but an unexpected visitor foils their plans. Meanwhile, Petr seeks to rescue Alena, who has been kidnapped by her own head of security.

Jack, Chavez and November pursue their Croatia lead to an unsettling affair. Chao takes a mandatory trip to Geneva to speak with his boss. Greer works on connecting the two shell companies.