Greg Sanderson is helping his wife, Jan, to recover from a nervous breakdown and revive their strained marriage. Their privacy is interrupted by the arrival of Greg's stunning and mysterious sister, Laura. Jan's paranoia deepens as she suspects that Greg's and her sister's relationship is too close. In her desperation, she confides her fears to the landlord but his weird reaction only creates more confusion.
Robert Carradine
as Greg Sanderson
Heather Locklear
as Jan Sanderson
Emma Samms
as Laura
Ned Beatty
as Landlord
Susannah York
as Dr. Sinclair
Melinda Cordell
as Mrs. Sanderson
Paul Mantee
as Professor McRoe
Leslie Danon
as Young Laura
Russell Baer
as Young Greg
