A beautiful woman, Kate (Tina Grenville), is released from a sanatorium unaware that while she was away her husband John (George Lazenby) has begun an affair with her sister Marianne (Wendy Hughes). The two sisters live together in a creepy apartment block while John is away, and find themselves stalked by some mysterious strangers.
Wendy Hughes
as Marianne Dickinson
Tina Grenville
as Kate Hersey
George Lazenby
as John Hersey
Patrick Ward
as Duncan
Chantal Contouri
as Rosa
Gordon McDougall
as Cookson
Charles Tingwell
as Redwood
