Overprotective mother Liz Benedict meets 18-year-old orphan Joanna Redwine and hires her as house help and live-in companion to rambunctious daughter Tara. Liz's husband Jeff isn't too thrilled with the arrangement, and his fears soon prove justified when Joanna begins to manipulate everyone and to slowly destroy the family. Meanwhile, next-door neighbor Dr. Linquist investigates and discovers Joanna has a disturbing past.
Patty Duke
as Liz Benedict
William Shatner
as Dr. Jeff Benedict
Quinn Cummings
as Tara Benedict
Stephanie Zimbalist
as Joanna Redwine
David Wallace
as Scotty
Kenneth Tigar
as Tom Montgomery
Virginia Kiser
as Mrs. Welford
John Houseman
as Dr. Lindquist
Hildy Brooks
as Barbara
Frank Birney
as Mr. Farragut
Ty Haller
as Minister
