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…

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…

Thomas Shelby has to deal with an IRA chief who has come to Small Heath to avenge his cousin’s death. Meanwhile Campbell gets closer to the stolen guns, and Grace…