Top Stasi agent Kleo Straub liquidates a target in a West German nightclub. Soon after, she must face a life-changing betrayal and a heartbreaking loss.

Determined to find her files, Kleo tracks down her former handler and makes her way into Stasi headquarters. Later, she seeks out Thilo in a dance club.

Kleo heads to Mallorca, chased by Sven. She infiltrates a party and uses a toxin to paralyze Wieczorek's wife, leading him to make a deadly confession.

With Min and Uwe on her tail, Kleo bribes a little girl to deliver a poisoned Bundt cake to Mielke's jail cell. After a showdown, Kleo digs up a letter.

Kleo and Sven form a wary alliance. Anne visits Kleo claiming to look for her grandfather. After failing to kill her, Uwe sets up a meeting with Kleo.

Severely wounded in a shooting, Kleo has a revealing flashback. With the ominous red suitcase seemingly in hand, Sven shares a devastating truth.

After Andi is wounded by Kleo, a double agent prevents him from unpacking the conspiracy behind the red suitcase. Sven, Kleo and Min move in on a mole.

Kleo and Sven arrive in Chile, where they track down an elusive Jorge. Later they tangle with Ramona, whose water breaks at an inopportune moment.

A surprise visit from her mother puts Kleo back on the trail of the red suitcase, which could have an unsettling link to her childhood.

Kleo plans a daring heist to retrieve classified files from the KGB, unaware that Sven is after them as well.

Kleo follows a lead to Belgrade, where Sven makes a romantic connection. Thilo is on a mission of his own.

Thilo discovers that his soulmate is not who she seems. Uwe receives a new target and uses the opportunity to set a deadly trap for Kleo.

Uwe is left cleaning up a mess. Sven unmasks a double agent, while Kleo heads for her family cabin in search of answers.

With the future of Europe hanging in the balance, Kleo prepares herself for a final confrontation in Moscow.