A third murder in the last two weeks is reported over the television, and police confess they have a psychotic madman on the loose, preying only on live-in nurses. One dark stormy night, Nurse Stella Crosson (Dana Wynter) and Nurse Betty Ames (T.C. Jones) are tending to their employer, a man with a heart condition who resides in a creepy old mansion just outside of town and needs constant attention. A phone call from the murderer informs the women that he knows they're alone, and intends to pay them a visit before the night is over. Checking to make sure all the doors and windows are locked, Stella finds that she overlooked a basement window, a mistake that might prove all too costly.
Did You Know?
The "Psycho" house on the Universal Studios lot is used for the house's exterior. See more
At 17:44 when the nurse counts the seconds between the lightning strike and thunder clap, she remarks that the strike was 3 miles away because she counted 3 seconds. She explains to the other nurse that each second is one mile. Actually, every five seconds is roughly a mile. So 3 seconds would be roughly 3/5 of a mile or, since sound travels about about 1130 feet per second in air, then the lightning strike was around 3390 feet away. See more