The first of two sequels written for ‘The Three Musketeers, ‘ Dumas’ beloved characters return for more adventurous duty in ‘Twenty Years After.’ As the title suggests, two decades have elapsed since D’Artagnan and his friends have prevailed over the evil machinations of Cardinal Richelieu and the icy Milady. However, danger and political intrigue still abound in both France and England, where the former is on the brink of civil war and the latter is nearly in the control of Cromwell. Add to these situations the scheming Cardinal Mazarin and the malevolent Mordaunt, son of Milady, and the retired Musketeers find themselves whisked out of retirement and directly into the chaotic swirl of stratagems, conflicted loyalties, and the effects from the passage of time in this impassioned fight for Queen and country.