The CIA scores a major break when Vitaly Yurchenko, a high-ranking KGB officer, defects to the US. Assigned as the lead in the debriefing, Aldrich Ames engages in a verbal cat-and-mouse game to determine whether he is in danger of being ratted out.

Cast: Jodie Whittaker, Paul Rhys, Harriet Walter, Ralph Brown, Stuart Milligan, Amelia Clarkson, Christina Cole, Catalina Denis, Julian Ovenden, Lex Shrapnel, John Lynch, Peter Guinness, Noel Clarke, Goran Kostic, Kieran O'Brien