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Covert CIA agent Martian is called back to London station; an incident in Belarus puts Bosko and Henry on a collision course with Langley; Danny learns a lesson and someone unexpectedly reappears in Martian's life.
Dr. Blake arrives from Langley and is put to a test by Martian and Henry; a spooked source threatens to put an operation at risk; Danny's cover is put in play; Martian, overtaken by events, begins to question Sami's motives.
Henry questions Martian's thinking; Bosko is briefed by Langley on a top-secret operation; Poppy makes a startling discovery; Martian confronts Sami about why she's in London and finds a needle in a haystack, before a heated session with Dr. Blake.
Henry and Martian wade into a diplomatic incident with the Belarusian delegation; dropped into her mission by Naomi, Danny walks a tightrope; Poppy and Martian attempt a fresh start; Osman threatens Sami.
Feeling the heat from Langley, Henry sends Owen to hunt for clues in Minsk; Danny's work with Reza generates an unexpected outcome; Sami is confronted by Osman about sensitive issues; Martian, seeing the size of the stakes, sets a rat trap.
Richardson's arrival at the Fishbowl catches Henry off guard; Martian scrambles to unravel Cossack's game as the stakes escalate; Naomi, uncovering a secret, cautions Danny; Sami's attempts to reach Martian lead to naught and Osman plays his hand.
Mr. Dalaga ups the pressure on Sami; Bosko is briefed on the scope of Valhalla; Jerome is advised to listen to his horoscope; Martian's hand is forced when Poppy's life is under threat; with Henry and the team, he strategizes a high-risk recruitment.
Martian's recruitment doesn't go to plan; Richardson breaks down the chinese play for Bosko; Blair uncovers an inroad to Volchok as Henry reminds Dr. Blake what's at stake; Danny wrestles with her conscience; Sami makes a confession.
Martian buys time with a crystal ball bluff to Langley; Blair and Owen hunt out a White Rabbit; Osman raises the stakes; Henry tasks Dr. Blake with an urgent assessment; Danny crosses the Rubicon; with a green light from Bosko, a trap is sprung.
As command of the operation shifts out his hands, Bosko shares a grim reality; Naomi receives troubling news out of Iran; Richardson runs a rogue operation; Felix gets overtaken by events; Martian makes a devil's bargain.