It is 1603, and as England wars with Spain and the bloody persecution of Catholics intensifies, a young nobleman resolves to avenge his kin and defend his faith by any means necessary.

As the king's network of spies close in on them, Catesby and Wintour attempt to raise an army for their plot across mainland Europe. Returning to London with Guy Fawkes in tow, Catesby assembles his gang of plotters for the first time. They know they must act fast, and the plan is formed - they will strike next week, 5 November, at the opening of Parliament.