1645: After years of civil war, King Charles I is overthrown and two heroes have emerged - Lord General Thomas Fairfax and his best friend and deputy General Oliver Cromwell. Their friendship is threatened when Fairfax and his wife conspire to return the King to power, and Cromwell instead orders his execution, seizing control. His armies spread violence and fear throughout the country, and Fairfax realizes Cromwell must be stopped, and their bond as two comrades-at-arms irreparably broken.