I is for Innocent

David Barney was acquitted of the murder of his rich wife, Isabelle. Now, Isabelles first husband, Ken Voigt, is suing Barney for her estate, claiming the jury made a fatal mistake. Why are Mr. Barneys witnesses denying ever having spoken to him? Why did Isabelle have so many enemies, including her best friend, Voights second wife, and her own twin sister?