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…