The espionage term “ Ponies ,” explains the title card to the Peacock spy drama of the same name, derives from the acronym for “persons of no interest.” In the winter of 1977, that’s exactly who Bea ( Emilia Clarke ) and Twila (Haley Lu Richardson) are: Americans in Moscow by virtue of their husbands’ jobs with the CIA, the women are plus-one invitees to the heart of the Cold War. But when said husbands die in a mysterious plane crash, Bea and Twila enter the arena themselves in search of