Frost and Kirsch worry their secrets will be unearthed when Langley investigators sweep Berlin Station to ferret out fodder for future Shaw leaks. Meanwhile, Daniel's hunt for the mole is put at risk.

Daniel teams up with Esther Krug of the BfV to prevent the next Shaw leak involving a foreign defector. Valerie and Robert spar over strategy as her investigation into Iosava gains traction; Hector gets a late-night visit from Shirley Pimple.