AKA "Blind Terror", which I think is the better title. Mia Farrow plays Sarah, a young woman who has lost her sight. She is staying with relatives at their mansion in the English countryside but things go terribly wrong when an unknown maniac enters the house. A tense game of cat and mouse ensues when she is left alone with the killer after he has killed the other occupants.
This is a bit of a slow burn but is worth the watch. Sarah really does suffer and Farrow delivers a fine performance, she is the best thing about this film. There are plenty of effective moments of terror on offer. Sarah is unaware that her family members have been murdered, unable to see the corpses scattered around the house but we can see them and it really is quite horrific. Great camera work, good cast - some very familiar faces to British audiences in particular - and plenty of groovy 70's fashions and tunes. The identity of the killer is not revealed until the end, with a red herring thrown in. My only criticisms are that the film is a bit slow at times and I could see no explanation as to why the events took place, but overall a good, tense chiller.