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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.