November 4th arrives, and with state opening looming on the horizon, Catesby and his co-conspirators load the tunnels below Parliament with barrels of gunpowder. Across the city, Father Garnet faces pressure from an ally to break his seal of confession and reveal the plot to the authorities - for the good of the already-oppressed Catholic faith. However, should the priest prove to be steadfast in his support of the would-be assassins, Lord Cecil may yet have another means by which to end Catesby's mission. Historical drama, starring Kit Harington, Mark Gatiss, Liv Tyler and Peter Mullan.