The young D'Artagnan and the legendary musketeers Athos, Porthos and Aramis are 'the inseparables' - ready to sacrifice everything in a duel or game of dice in order to defend their honour or that of the King and Queen of France. Handsome and hot-tempered, they dive into raging battles or back-street conspiracies with gusto, especially if by their daring deeds they can thwart the wicked devices of their arch-enemy, Cardinal Richelieu, and his mysterious accomplice, Milady de Winter.