A young girl lives with her mother and grandmother. One day her estranged father returns home with a female companion he introduces as his fiance. Soon the girl finds herself in the midst of strange goings-on, which evolve into a web of crime and murder.

Robert Shaw
as Michael

Sally Kellerman
as Anne

Mary Ure
as Katherine

Sondra Locke
as Marguerite

Signe Hasso
as Julia

Mitchell Ryan
as Inspector McKenna

Gordon Devol
as Hector

Gordon Anderson
as Aaron (voice)

Victoria Risk
as Peggy

Leonard Crofoot
as Aaron