Spoilers for Scott Turow’s 1987 novel Presumed Innocent. Barbara Sabich killed Carolyn Polhemus. Rusty Sabich is acquitted, but the trial does not publicly expose Barbara: Rusty’s first-person account has concealed crucial knowledge, leaving the murder’s truth private between him and his wife.
How Carolyn’s murder turns Rusty into the accused
Rusty Sabich is Kindle County’s deputy chief prosecutor and Carolyn Polhemus’s former lover. After Carolyn is found murdered in her apartment, Rusty and police officer Dan “Lip” Lipranzer investigate. The case soon shifts: Rusty is removed from the investigation and charged with her murder.
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The investigation also uncovers Carolyn’s “B file,” material concerning a bribery investigation connected to an unidentified official. The file’s significance becomes clearer as the case reaches court: Carolyn’s murder is entangled with a second, institutional scandal.
How Rusty gets acquitted
The state points to Rusty’s fingerprint on a drinking glass and the matching blood type of sperm found in Carolyn’s body. But the prosecution’s case weakens during trial. The fingerprinted glass goes missing, and testimony undermines the state’s account.
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After the prosecution rests, Judge Lyttle dismisses the case. Rusty realizes Lyttle is the official implicated in the B file: his lawyer had invoked the file to pressure the judge into dismissing the charge. Rusty is legally cleared, but the dismissal does not establish who actually killed Carolyn. TIME’s contemporary review describes the trial as the novel’s centerpiece while noting that its proceedings may have little bearing on the circumstances of the murder.
The biggest reveal: Barbara killed Carolyn
After the trial, Lip tells Rusty that he kept the missing glass. Rusty then reveals that Barbara killed Carolyn after learning about Carolyn’s affair with him. The novel’s killer is not Rusty, despite the evidence that helped put him on trial.
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The revelation changes how the preceding account reads. Rusty has withheld the decisive truth, so his narration is not a transparent record of everything he knows. SuperSummary’s account says he knew the killer’s identity nearly from the beginning; Michael Bourne’s 2013 Chicago Literary Hall of Fame essay likewise describes Rusty as quietly covering up evidence and questions how fully a reader can know his inner life.
What the B file reveals about the case
The B file links Carolyn’s investigation to bribery and judicial corruption. Its importance is not that it identifies Carolyn’s killer; it helps explain why Judge Lyttle has a hidden stake in the proceedings and why Rusty’s acquittal does not amount to a public resolution of the murder.
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The case therefore has two different outcomes: the state fails to prove Rusty guilty, while the truth about Barbara remains undisclosed in court. The legal result is real, but it leaves the central factual question unanswered for everyone outside Rusty and Barbara.
Why Rusty’s narration is unreliable
Rusty tells the story in the first person, but the account withholds knowledge that would change the reader’s interpretation of the case. That makes the narration strategically incomplete: the reader is not simply following an investigation, but relying on a narrator who has reasons to control what is known.
In his essay for the Chicago Literary Hall of Fame program, Michael Bourne says Turow is “calling into question a central conceit of psychological realism, that through fiction, we can come to know the human heart.” Bourne summarizes the point as “we can’t, not really.” Those are Bourne’s words about Turow’s narrative design, not a direct quotation from Turow.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What happens to Barbara and Rusty at the end?
Barbara leaves with the couple’s son, and Rusty is left alone. Politically, however, Rusty regains power: Nico is recalled after the case’s debacle, and Rusty is appointed Kindle County prosecutor. People who had abandoned him during the prosecution begin seeking his favor once he holds office again.
Is the book ending different from the Apple TV+ adaptation?
Scott Turow’s official site identifies an Apple TV+ adaptation, but the available information here does not establish a full book-to-screen comparison. It is not enough to say whether the adaptation changes the killer’s identity, Rusty’s knowledge, the courtroom mechanism, the family aftermath, or the role of institutional corruption. The ending details above are specific to the novel.
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