Margot Kidder
as Danielle Breton/Dominique Blanchion
Jennifer Salt
as Grace Collier
Charles Durning
as Joseph Larch
William Finley
as Emil Breton
Lisle Wilson
as Phillip Woode
Barnard Hughes
as Arthur McLennen
Mary Davenport
as Mrs. Peyson Collier
Dolph Sweet
as Detective Kelly