S1, E4: Marina moves to London for a new opportunity, and Danny is unconvinced by information Saara shares from an anonymous source. Saara's hand is forced when Kathy informs her that GCHQ is about to reveal the names of the FSB coders.

S1, E4: Marina moves to London for a new opportunity, and Danny is unconvinced by information Saara shares from an anonymous source. Saara's hand is forced when Kathy informs her that GCHQ is about to reveal the names of the FSB coders.