An aspiring young physician, Robert Merivel found himself in the service of King Charles II and saves the life of a spaniel dear to the King. Merivel joins the King's court and lives the high life provided to someone of his position. Merivel is ordered to marry one of the King's mistresses in order to divert the suspicions of another one of his mistresses. He is given one order by the king and that is not to fall in love. The situation worsens when Merivel finds himself in love with his new wife.