Betty Epstein has plenty to prove. She must prove she belongs on the police force. She must prove she did not waste a hard earned education. She must prove she can handle a relationship despite the unending stress of work. Most important, Betty must prove she can solve a murder, starting on day one of her job. Betty and her partner, Sergeant Detective Jose Luna, quickly meet the suspects. The unscrupulous business partner, spurned wife, disgruntled investor, irate neighbor and secret girlfriend all have motives, means and opportunity. The investigation is hindered by misleading falsehoods, reluctant witnesses, and New England snobbery. Betty's personal life is more complicated that her case. Her ex fiance, a U.S. Attorney, makes her life difficult as their investigations collide. Dr. Isaac Bernstein, the medical examiner, brings a welcome warmth to the lonely life of a detective. The budding romance is constantly interrupted by the twists and turns of the case. Mansfield Avenue is a journey through a world of deception, genteel snobbery, family secrets, and intentional misdirection in search of ultimate justice.