A woman that during the daytime is an insignificant librarian, at night becomes a fascinating mysterious dark lady. She uses the personal advertisements on the newspapers to obtain appointments with men then kills them. These murders last until the wife of one victim decides to investigate.

Stephanie Zimbalist
as Sarah Martin

Jennifer O'Neill
as Heather Moore

Robin Thomas
as Evan Martin

Rosemary Dunsmore
as Susan Merchant

Gina Gallego
as Theresa Casona

Colm Feore
as

Clark Johnson
as

Dave Nichols
as Michael

Patricia Collins
as Dr. Kenderson

Joseph Griffin
as Julio Casona