When the bug is found in Linda's desk, NATO is placed on high alert. Linda arrives to visit Martin, who scrambles to turn her loyalties around.

The episode was rated 7.90 from 384 votes.

Martin arrives in Frankfurt, in the midst of preparations for a major terrorist attack. Desperately, he tries to prevent the ignition of a bomb, and in the process encounters his aunt Lenora. Fuchs and Dietrich are preparing to turn their backs on the GDR forever.

The episode was rated 7.88 from 32 votes.

As preparations for NATO's nuclear war game "Able Archer" intensify, Martin receives an order from East Germany that cements his fears about their paranoia. He must warn his Western superiors about the misunderstanding.

The episode was rated 7.86 from 368 votes.

Martin is kidnapped and has to fight for his life. Schweppenstette tries to save his son while his "wife", Nicole, and Max face an imminent threat in Frankfurt. Tina and Ingrid reveal Tischbier's biggest secret.

The episode was rated 7.84 from 31 votes.

Lenora is grounded and demoted after the cruise ship plan is uncovered.

The episode was rated 7.82 from 110 votes.

Martin is supposed to prevent further liberal reforms from being passed by the GDR government. Following his own plan, he gets caught up in a chain of events that bring the Berlin Wall down. In a fateful encounter he meets Nicole, Max's teacher. Lenora has become radicalized in prison. The HVA must act now.

The episode was rated 7.77 from 48 votes.

When Moritz returns to his undercover life in West Germany he is drawn into Alex Edel’s fatal plans. Recovering in a room at Charite, Moritz encounters Annett for the first time since he left. He wants to stay home now, she tells him to go West again. Much is left unsaid. She is now in with Schweppenstette, who visits him next and insists, in a tense, father-son coded argument, that Moritz return to his post. Meanwhile Alex Edel has taken General Jackson hostage and forced him, at gunpoint, to film a seething denouncement of US military plans in Western Europe. Lenora follows the whole thing over the wire from the StäV. But by the time Moritz and Kramer get there to break them out before the Police arrive, the damage is already done.

The episode was rated 7.77 from 362 votes.

Martin is ordered to break into the hotel room of a high-ranking NATO official and steal a top-secret report.

The episode was rated 7.73 from 463 votes.

Martin is sent back to East Berlin, but is forced to deliver a seemingly harmless package to a mysterious man in West Berlin on the way.

The episode was rated 7.73 from 374 votes.

Martin is finally able to return to the East and see his son for the first time.

The episode was rated 7.71 from 107 votes.