NOTHING UNDERNEATH

Bob is a forest ranger working at Yellowstone National Park, while his twin sister Jessica has become a jet-setting fashion model based in Milan; he claims they have had a psychic bond since childhood. After receiving a copy of a magazine she did a shoot for with her contact information, he suddenly has a vision of her being murdered. Bob quickly heads to Milan and checks into the same hotel as his sister, but finds she has disappeared. Upon meeting local police commissioner Danesi, who is on the verge of retirement, he convinces a skeptical Danesi to look into the case.

Bob begins questioning other people who worked with Jessica, including Barbara, another high-profile model with the same agency Jessica worked with, who hints at a romantic attraction to him. However, several other models who knew Jessica are found murdered with a pair of scissors—the same weapon Bob envisioned his sister being killed with. One of the victims is found to have a cache of diamonds in her possession, which immediately directs suspicion to Giorgio Zanoni, a wealthy fashion designer known to host private parties with models. When the police question Giorgio, he reveals Jessica and the other murdered women were present with him the night of a private party where a game of Russian roulette accidentally killed another fashion model; he disposed of the body and bribed the others with diamonds in exchange for their silence.

Giorgio is arrested and jailed, and the police establish Jessica as the prime suspect in the killings of the other models, but Bob remains suspicious, particularly when he receives a telegram allegedly from Jessica asking him to return home. Bob traces the telegram back to the post office in Lugano where it was sent from, and upon heading there and asking for the original handwritten copy of the message, he spots inconsistencies in Jessica's signature. All the while, an Interpol agent in contact with Danesi has been tailing Bob out of suspicion. Bob returns to Milan, checks out of his hotel, then heads to a large studio apartment he expects to find a lead at. He finds the door locked with no one answering, but manages to climb through the apartment window, injuring his arm in the process. In the apartment he discovers that someone has forged Jessica's handwriting, and also finds Jessica's dead body pinned to a chair.

Bob telephones Danesi to warn him, but is forced to hide when he hears someone entering the apartment; it is revealed to be Barbara, who had attempted a lesbian relationship with Jessica, but murdered her after she rejected her advances. She also killed the other models, framed Giorgio, and sent the telegram to Bob in an attempt to throw him and the police off her trail. When Barbara discovers Bob hiding in the apartment, she attacks him with an electric drill, but Danesi and the Interpol agent arrive and unplug the drill before she can kill Bob. Seeing she has no way out, Barbara pushes the chair Jessica is pinned to out of the window and jumps after it to her death.

Barbara, a fellow model, is revealed as the murderer after Bob discovers Jessica's body and evidence of forgery. Barbara attempts to kill Bob but is stopped by the police before taking her own life.

The film's climax ties together the psychic premonition, the string of murders, and the entangled relationships within the fashion industry. Barbara’s motives—rooted in jealousy and unrequited affection—underscore the film’s theme of hidden darkness beneath glamour. Justice is ultimately served, but not before the fashion world’s facade is violently ripped away.