For the Isabel Dalhousie fans in the audience, Alexander McCall Smith’s newest in this series, “The Forgotten Affairs of Youth, is a winner.  Isabel’s life is moving forward.  Charlie is going to preschool, and she and Jamie are planning a wedding.  She continues to fight with her niece Cat.  More importantly, Dr. Dalhousie continues to struggle with the ethics of every situation.  While trying to help out a fellow philosopher, she again is faced with a moral dilemma.  Has she done the wrong thing for the right reason?  Can a lie ever be acceptable?  This highly readable series, does McCall Smith every sleep, strikes the right cord.  Interesting characters, a simple plot with moral overtones, and great walking tours of Edinburgh.