Resistance

At the height of the War of Independence, Jimmy Mahon is given an intelligence role while Ursula Sweeney, a code-breaker with British intelligence at Dublin Castle, contemplates treason.

Distressed at the civilian death toll, Arthur returns to his family but Peggy begs him not to desert as they rely on his army pay. Charles is trapped in the Castle while his wife Vanessa discovers that he has got her guest May pregnant. Elizabeth tries to save Peter’s life when he is shot by a sniper. Frances fights alongside Jimmy as he picks off advancing British soldiers and as they flee the scene she shoots one at point-blank range. The British Army closes in on the GPO as Elizabeth breaks the news of his nephew’s death to Jimmy.

In the aftermath of the multiple attacks on General Winters' spy ring, the British close ranks. Elsewhere, there is a price on Ursula's head and Jimmy finally confronts the mole inside Collins' Squad.

Jimmy Mahon is moved from active service on Michael Collins' squad to an intelligence role after he's identified during an IRA hit.