So “Scarpetta,” a series whose eight-episode first season premieres Wednesday on Prime Video, is a major event for mystery fans. And the show has a cast whose cachet reflects that status, starting with Nicole Kidman as Kay Scarpetta, the chief medical examiner of the Commonwealth of Virginia. Jamie Lee Curtis stars as Scarpetta’s older sister, Dorothy; Ariana DeBose as Dorothy’s daughter, Lucy; and Bobby Cannavale as Dorothy’s husband, the former detective Pete Marino.