As Sandy conducts her review of the agency's spycraft, she and Jeanne continue to clash. When a potential asset contacts the CIA claiming to have vital information about a communications breach, Sandy has her doubts about the man known as GTPROLOGUE.

Cast: Jodie Whittaker, Paul Rhys, Harriet Walter, Ralph Brown, Stuart Milligan, Christina Cole, Catalina Denis, Lex Shrapnel, Todd Boyce, Christian Contreras, Oliver Cotton, Goran Kostic, Aisling Bea, Saulius Cepla, Simona Dambauskas