'Secret City: Under the Eagle' picks up with Harriet Dunkley (Torv), not long out of prison and unwittingly ensnared in a military and political cover-up with Catriona Bailey’s (Weaver) fingerprints all over it. Harriet’s search for the truth leads her back into Canberra’s corridors of power, this time working for a maverick Independent MP (Cormack). What she unearths is a military program so secret not even the Prime Minister (Hany) is aware of it and begs the question of who is really running the country?