Carolyn Polhemus’s murder on April 1 becomes the event around which the novel’s investigation, prosecution, and concealed private truth turn. Its apparent clues point toward Rusty Sabich, but the case’s eventual reconstruction identifies Barbara Sabich as the killer, exposing the distance between a persuasive evidentiary story and what actually happened.

Discovery and Early Account

Three nights after Carolyn’s death, Raymond Horgan discusses the case with Rusty. Raymond is grieving both as the former supervisor who hired Carolyn and as someone who had known her since her earlier work as a probation officer. He recalls her as intelligent and capable, but his account of the crime assumes an intruder: he believes someone broke in and that the case should not begin by looking among her friends and admirers. The murder is already entangled with office politics, public scrutiny, and personal loss.

Rusty challenges that first explanation. He points out that there are no broken windows or forced doors, details that sit uneasily beside Raymond’s assumption of a break-in. That early disagreement establishes a question the investigation will keep circling: whether the scene indicates a stranger’s intrusion or someone who could enter without forcing a way in. The uncertainty is consequential, but it does not immediately yield a suspect or explain why the crime was staged as it was.

The initial account from the police reports describes a fatal head injury and resulting hemorrhage. The medical report finds evidence of sexual activity, but only in the principal vaginal area; investigators have turned the apartment upside down without finding a murder weapon. These early findings supply fragments rather than a complete sequence. The distinction between what the investigators can establish and what they infer will shape the case as the physical evidence is assembled and interpreted.

When Rusty later examines the photographs, he struggles to maintain professional distance from the images of Carolyn. His response is conflicted: professional attention gives way to an involuntary sense of satisfaction, followed by recognition of her vulnerability and a feeling that she needs his help. The moment connects the investigation to Rusty’s private attachment to Carolyn, while making clear that his role as investigator is not emotionally detached.

The Prosecution’s Circumstantial Case

By the time Rusty reviews the prosecution’s witness list, the case against him has taken a definite shape. It includes people who place him near Carolyn Polhemus’s building or on a bus route around the relevant period, along with Dan Lipranzer, who may testify that Rusty told him not to subpoena Rusty’s home telephone records. Raymond Horgan, Tommy Molto, Rusty’s secretary, his psychiatrist, and scientific experts also appear on the list. Yet no witness claims to have seen Rusty kill Carolyn, and the prosecution has no confession to offer. Its case depends on physical traces and the interpretation placed upon them.

Those traces form a sequence that seems to connect Rusty to Carolyn and to the night of the murder. A bar glass bears two of Rusty’s fingerprints, identified against prints he had provided years earlier as a deputy prosecutor. Telephone records show a call from his home to Carolyn’s about an hour and a half before her death. Forensic testing finds sperm of Rusty’s blood type and a contraceptive compound in Carolyn’s body, which the prosecution’s interpretation treats as evidence of a consensual encounter. Fibers found on Carolyn’s clothing and at the scene are matched to the carpet in Rusty’s home. Each item appears to reinforce the others, but together they remain circumstantial: they establish contact and resemblance more readily than they establish who committed the killing.

The fingerprint testimony makes that distinction visible in court. Maurice Dickerman, a skilled fingerprint examiner, explains how prints are formed and why their patterns are unique, then presents photographs of the glass, lifted impressions, and enlargements from Rusty’s employee file. Red arrows mark the points of comparison. The presentation gives the prosecution’s claim the clarity of a demonstration, but the judge has already told the jury that an error in the fingerprint evidence is possible and that acquittal remains a permissible conclusion. Dickerman’s technical confidence therefore arrives after the court has made room for doubt; the images can be persuasive without settling how or when the prints were left.

Dr. Kumagai’s testimony attempts to join the separate findings into a reconstruction. Drawing on the forensic analyses and his examination of Carolyn’s body, he places sexual relations shortly before the fatal attack and interprets the evidence as indicating a consensual encounter. He also offers an opinion about the attacker’s handedness, while acknowledging that the available evidence cannot establish the attacker’s height without knowing Carolyn’s posture or the weapon’s length. In his account, the scene’s open doors and windows, together with the contraceptive evidence, suggest an effort to simulate rape and conceal the killer’s identity. He further infers that the person responsible knew something about criminal investigation and Carolyn’s work in the prosecutor’s office. These are expert conclusions built from evidence, not direct observations of the killer.

Alejandro Stern’s cross-examination exposes a limit within that reconstruction by asking whether Carolyn knew that she could not conceive. Dr. Kumagai answers no. The exchange does not itself identify another perpetrator, but it unsettles the apparent fit between the prosecution’s biological evidence and its account of what happened. As the trial proceeds, the question of whether the forensic findings have been correctly interpreted becomes as important as the findings themselves.

The Hidden Construction of the Crime

In October, while repairing the fence in the yard, Rusty Sabich recognizes the Whatchamacallit he is using as the weapon that killed Carolyn Polhemus. The black iron tool, inherited from Barbara Sabich’s father, had been brought to their home by Barbara’s mother after his death. Rusty had noticed blood and a blond hair on it after the trial, then taken it to the basement and washed it while Barbara watched from the stairs. The ordinary work of replacing fence posts thus brings the concealed crime into the domestic space where its evidence had been hidden.

Rusty’s later reconstruction gives Barbara’s actions a deliberate sequence. He believes she logged into a university computer to establish an alibi, then went to Carolyn’s apartment, where Carolyn let her in. Barbara used the Whatchamacallit, bound Carolyn with cord, left a glass at the bar, planted male fluid from a small bag, and unlocked the doors and windows before leaving. Her aim, as Rusty describes it, was to direct suspicion toward him by making the scene appear to point to a sexual encounter and a familiar killer. The account identifies the staging without making it proof that every detail of Rusty’s reconstruction is independently established.

The plan depended on assumptions about which traces investigators would notice and how they would interpret them. Rusty points to carpet fibers on Barbara’s skirt, hair evidence, the call traced through the home telephone records, and a third fingerprint on the glass as details she had not adequately accounted for. The biological evidence also rested on a false premise: Carolyn had had her tubes tied, a fact neither the investigators nor Barbara had anticipated. In this account, evidence that had seemed to converge on Rusty instead records the limits of Barbara’s design—and the limits of the prosecution’s interpretation of the scene.

Barbara says she would have told the truth if called to testify. Rusty says he understands, but believes that her account would have sounded like a desperate attempt to save him and that no one would have believed she was responsible. Her willingness to speak does not undo the ordeal he has endured, and his acceptance does not remove her guilt. By the end, their relationship has recovered some feeling, but the murder remains between them as a truth they cannot freely share.

The Crime in the Domestic Space

The murder’s last return is not in court but in the yard and basement of the Sabich home. As Rusty washes the Whatchamacallit, Barbara stops on the stairs; he tries to seem cheerful and whistles. The small exchange makes the concealment itself part of their shared life: the evidence is handled at home, in her presence, while ordinary gestures preserve the appearance of normality. Later, the same tool reappears in Rusty’s mind during fence repairs, turning a practical task into recognition. The crime’s consequence is therefore not only that its clues misdirected the investigation, but that its physical trace remained embedded in the couple’s domestic world, where recognition could not make the past speak openly.