At the height of the War of Independence, Michael Collins’ squad member Jimmy Mahon is given an intelligence role while Ursula Sweeney, a code-breaker with British intelligence at Dublin Castle, contemplates treason.
General Winter targets Sinn Féin's propaganda machine and their finances, while Jimmy puts pressure on Ursula to feed him information
Jimmy breaks Joey out of prison, and helps Ursula to be reunited with her son. Eithne's outrage at Diarmuid's death is ignored, and Maurice faces an impossible choice.
General Winter suspects Lily of being a spy, and Ursula must try to help her without implicating herself. Robbie plans to kill Eithne, but is stopped by an unexpected opportunity.
A price is placed on Ursula's head following the attack on General Winter's spy ring, and Jimmy confronts Brogan in the midst of the Bloody Sunday Massacre. Last in the series.
