Son of a Gun ***
Rebecca Hart, Van Hughes     By Patrick ChristianoWhile there is much to like even admire and enjoy in Don Chaffer's new musical Son of a Gun, the tale concerning a father and son conflict is all over the map without focus. The result is a heartfelt engaging mess. That Chaffer is a passionate storyteller is evident in his sensitive lyrics and smooth melodies. The book, which Chaffer co-wrote with Chri…