Long before Angela Lansbury brightened TV screens as prime-time s not-so-young literary sleuth in Murder, She Wrote, Mildred Natwick and Helen Hayes joined forces to solve mysteries as The Snoop Sisters.  Forming a one-of-a-kind whodunit writing team, eccentric elderly sisters Ernesta and Gwendolyn Snoop s insatiable curiosity all too often leads them to be deeply embroiled in real-life murders in New York City.   The Snoops Sisters witty imagination and utter determination were beloved by audiences young and old. For the first time ever on home video, this highly-anticipated collection includes the original TV movie pilot plus the four 90 minute telefilms.