The Explosion of a Fishing Boat is detected. CIA Agent Rafael Torres violates the Station Chief of Berlin Station Orders and retrieves the burned body that he believes is of Missing CIA Agent Daniel Miller.
B.B.'s arrival in Berlin is met with mixed emotions. April attempts to get Sofia back into the fold, but is violently thwarted by Sergei, an operative involved in the Estonia gambit. April escapes alive, but Sofia is nowhere to be found. Esther wants to find Daniel, but Valerie stonewalls her, so she enlists Frost to track down Daniel while Torres and Kirsch follow their own lead in Vienna. There, they discover an arms dealer who sold an arsenal of weapons to Vassily Krik, a high-ranking Russian oligarch, who may be holding Daniel Miller alive.
Valerie and B.B. rally the support of the 14-EYES, a powerful intelligence collective. Kirsch and April, using Sofia as bait, trap Sergei. Kirsch offers to swap Sergei for Daniel. April comes clean to her asset, securing the tech for U.S. interests. Esther activates Bruno, a German Special Operator, to locate Daniel. Frost introduces Torres to Hector, whose new identity as a roofer to oligarchs provides a way to infiltrate the Russian elite. Frost investigates one the soldiers formerly under Krik's command to gain kompromat from his war days.
Valerie is stunned when B.B. betrays her and votes against the 14-Eyes invoking Article V. April faces the loss of the tech when her assets are arrested and face deportation. Kirsch's spy swap goes horribly awry when Bruno, Esther's officer, is exchanged instead of Daniel. Platov invites Hector and Torres to Krik's dacha, forcing them to navigate the treacherous world of Russian oligarchs. Their mission is upended when Hector falls out of favor with Krik and finds himself human prey in their evening hunt, along with one other prisoner: Daniel.
Frost volunteers with Valerie's reluctant consent to rescue Daniel from Krik's estate. When Daniel confronts Frost about his past alias as "Driver" shots are fired. Hector is a secret witness. Krik is arrested by his government. Daniel's body is dumped on the streets of Berlin. Torres uses his cover as a ruse to get Platov to Germany. The Estonian communications network is hijacked, but Sophia can only use her master password by returning to her country.