Plot
Clarice Starling, a young FBI trainee at Quantico, is recruited by Behavioral Science Unit chief Jack Crawford to interview Dr. Hannibal Lecter, a brilliant and cannibalistic psychiatrist imprisoned at the Baltimore State Hospital for the Criminally Insane. Officially conducting a psychological survey, Starling is actually meant to draw out insights that could help capture "Buffalo Bill", a serial killer who murders young women and removes their skin.
At the hospital, the manipulative director Dr. Frederick Chilton makes unwelcome advances toward Starling before escorting her to Lecter's cell. Initially courteous, Lecter grows dismissive upon deducing Crawford's ulterior motive. As Starling departs, inmate Miggs flings semen at her, provoking Lecter's disgust. He summons her back and offers an anagram as a clue that leads her to a storage unit containing a severed head in a jar—later revealed to belong to Benjamin Raspail, a former patient of Lecter whose killer is believed to be Buffalo Bill. Soon afterward, Miggs is found dead, having swallowed his own tongue—implicitly orchestrated by Lecter as retribution. Lecter agrees to assist in exchange for a transfer away from Chilton. Meanwhile, another victim is discovered with a death's-head moth lodged in her throat—the same species later found inside the severed head.
When Buffalo Bill abducts Catherine Martin, daughter of U.S. Senator Ruth Martin, Crawford authorizes Starling to offer Lecter a fraudulent deal: a prison transfer in return for actionable intelligence. Lecter instead demands a quid pro quo, extracting personal details from Starling, who reveals that her father, a police officer, was murdered when she was ten, leaving her orphaned. In exchange, Lecter reveals that Buffalo Bill is not a genuine transsexual but mistakenly believes he is, having possibly been rejected from gender-reassignment clinics due to psychological instability. Chilton secretly records the conversation, exposes her deceit, and offers Lecter relocation to Tennessee in exchange for information. Lecter complies and is flown to Memphis, where he provides Senator Martin with accurate details about Buffalo Bill's appearance but falsely identifies him as "Louis Friend". Meanwhile, Buffalo Bill holds Catherine captive in a dry well in his basement, demanding she apply lotion to her skin; Catherine manages to seize his dog, Precious, as leverage.
Starling deciphers "Louis Friend" as an anagram for "iron sulfide" (fool's gold) and confronts Lecter in his temporary cell at a Memphis courthouse. Lecter demands deeper revelations and offers a cryptic clue—"we covet what we see every day"—before Starling recounts a traumatic childhood incident: after her father's death, she lived on a relative's Montana farm, where she failed to save spring lambs from slaughter. Lecter intuits that saving Catherine might silence this recurring trauma and, satisfied, returns the case files. That night, he uses a piece of Chilton's pen to unlock his restraints, murders two guards, and escapes in an ambulance disguised in a dead guard's uniform and skinned face.
Analyzing Lecter's annotations, Starling deduces that Buffalo Bill knew his first victim, Frederika Bimmel, a tailor from Ohio, and follows the lead. At Bimmel's home, she finds unfinished dresses and patterns matching patches of skin removed from the victims, realizing Bill seeks to construct a "suit" of human flesh and starves his captives to loosen their skin. Crawford cross-references Lecter's profile with names from Johns Hopkins and the Known Offenders database, identifying Jame Gumb as the prime suspect; the name is confirmed through LAX customs papers listing Gumb as the addressee of live death's-head moth caterpillars imported from Suriname. While Crawford's team raids Gumb's vacant Calumet City residence, Starling interviews Bimmel's acquaintances and arrives at a house where Gumb poses as "Jack Gordon". His façade crumbles when Starling spots a death's-head moth.
Pursuing Gumb into his basement, Starling discovers Catherine trapped in the well. Gumb stalks Starling in complete darkness using night-vision goggles, but betrays his position by cocking his revolver; Starling fires instinctively and kills him. Catherine is rescued.
Starling graduates from the FBI Academy. During the post-ceremony party, Lecter calls from an unnamed tropical location, asking whether "the lambs have stopped screaming." He assures her he has no intention of pursuing her and asks that she return the favor—a vow she declines. Lecter announces he is "having an old friend for dinner" before trailing Chilton into a crowd.