THE GIRL IN BLACK STOCKINGS

A lodge in Kanab, Utah, is where Los Angeles lawyer David Hewson goes for a peaceful vacation. He is quickly attracted to Beth Dixon, a switchboard operator and a personal assistant to lodge owner Edmund Parry.

The murder of playgirl Marsha Morgan, her throat cut, disrupts the peace and quiet. Sheriff Holmes begins the investigation, starting with the wheelchair-using Parry, who admits to hating the dead woman, and Parry's possessive sister Julia, who helps him run the lodge. It turns out David once dated Morgan as well.

A new guest, Joseph Felton, checks in. The sheriff's suspects also include guests Norman Grant, a drunken actor, and his ambitious girlfriend, Harriet Ames. A missing kitchen knife believed to be the murder weapon is found by Indian Joe, who works at the lodge.

Beth eavesdrops on a phone call Felton makes from his room. She overhears him speaking to a man named Prentiss. Felton is later found killed by drowning, and it turns out he was a private detective. David becomes more and more convinced the Parrys are behind all this. Ames is seen kissing Edmund Parry, which does not please Edmund's sister or Grant. Shortly thereafter, Ames is brutally murdered.

To his shock, David arrives as Beth holds a knife to Julia Parry's bloody throat, claiming to have stabbed her in self-defense. It turns out, however, that Prentiss is Beth's husband, and he had hired the private investigator Felton to find the psychologically disturbed Beth, who is responsible for all the murders.

It is revealed that Beth is responsible for the murders, having been sought by a private investigator hired by her husband; the truth comes out after another violent confrontation.

The ending delivers a classic whodunit twist, unmasking the least suspected character as the culprit. By tying the murders to Beth's psychological disturbance and hidden past, the film closes its circle of suspicion and motive, leaving its surviving characters—and the audience—questioning just how well anyone can really know their fellow guests.