1653: The long and bloody English Civil War is at an end. King Charles is dead and Oliver Cromwell rules the land as king in all but name. Richard Treadwell, an exiled royalist officer and soldier-for-hire to the King of France and his all-powerful advisor, the wily Cardinal Mazarin, burns with revenge for those who deprived him of his family and fortune. He decides upon a self-appointed mission to return to England in secret and assassinate the new Lord Protector. Once back on English soil however, he learns that his is not the only plot in motion.