Supreme Court clerk Avery Keene is back, trying to get her feet on solid ground after unravelling an international conspiracy. But as the sparks of Congressional hearings and political skirmishes swirl around her, Avery is approached at a legal conference by Preston Davies, an unassuming young man and fellow law clerk to a federal judge in Idaho. Davies believes his boss was being blackmailed in the days before she died. Desperate to understand what happened, he gives Avery a file, a burner phone, and a fearful warning that there are highly dangerous people involved. Another shocking murder leads Avery to a list of names – all federal judges – and, alarmingly, all judges on the FISA Court (the United States Foreign Intelligence Surveillance Court), also known as America’s "secret court." It is this body which grants permission to the government to wiretap Americans or spy on corporations suspected of terrorism.