In "Twenty Years After" the much beloved D'Artaganan, Athos, Porthos and Aramis reunite to fight the forces of evil. In the original novel they defeated Milady, a formidable foe; now they need to face her vengeful son Mordaunt, as well as countering the machinations of the sinister Cardinal Mazarin. Their adventures also take them to England, where Cromwell is about to topple Charles I. Meanwhile, they must overcome the obstacles which the passing of time has placed between them. Rediscovering strength in unity, they fight for Queen and country.