His brother and sister introduce him to Kitty McCarthy, an American heiress, in the hope that he will marry her and so gain access to her fortune which will help out his family.
Back in the main story line, Reginald has discovered that he loves Kitty for herself and doesn't care about her not having a fortune.
Back at the family seat Reginald has found a way to make money from other idle members of the English aristocracy.
He sets up a "Home for the Idle Wealthy" and they come to stay (for a fee) and act as butler, gardener, chauffeur etc.
The leading actors were both in plays in London, and so after their evening performance they would come out to Twickenham to shoot their parts.