If you haven't read "The Help", I think that would be doable on a run. It has multiple characters and moves along... Also "Testimony" by Anita Shreve - that moved rather quickly...and has a great twist... I also listened to "Half Broke Horses" - interesting, but not one of my favorites - but definitely long enough. Motivational - "How Full Is My Bucket"
Hope some of them work for you - happy reading, er, listening :)
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