Brian Clemens’ script has Mia Farrow recuperating from a blinding horse riding accident at the home of Robin Bailey, his wife Dorothy Alison and daughter Diane Grayson. An innocently-offended young punk slays the household while Farrow is riding with fiance Norman Eshley. Extremely good suspense is built and maintained as Farrow discovers the senseless murders, then outwits the murderer who has returned to recover a wrist bracelet.
Paul Nicholas, the murderer, is not seen facially until the climax though Gerry Fisher’s lensing puts the mysterious character in an emphatic dramatic posture throughout via shooting his boots and arrogant bodily mannerisms. Clemens’ script seeds the plot with a thousand sock red herrings, but Farrow’s lengthy travails in time become rather heavy on the meller side; all that’s missing is for her to be trapped on an ice floe.
Farrow’s performance as a blind girl is very convincing, grabbing and maintaining audience sympathy for her character.