Black Widow

Catharine (Theresa Russell) is a sultry beauty who meticulously sets her traps. Alex (Debra Winger) is a federal sleuth who just as meticulously uncovers what no one else suspects-that this femme fatale tricks wealthy men into marrying her, then kills them to inherit their fortunes. Soon Alex's obsession with the mysterious Catharine draws her deeper and deeper into danger. (official distributor synopsis)