Katerina shows Ivan Mitya’s letter at the moment Ivan is struggling to face the possibility that Smerdyakov murdered their father—and that Ivan himself helped bring the crime about. Mitya’s drunken threat, preserved on paper, seems to settle Ivan’s uncertainty: he takes it as proof that Mitya killed their father, and therefore as reassurance that Smerdyakov was not the murderer and Ivan was not guilty of putting him up to it. The scene’s decisive turn lies in this swift conversion of moral doubt into apparent certainty, a certainty the letter appears to support but cannot, by itself, establish.

The Confession and the Document

Ivan has been walking about the room and speaking in a strange, disconnected way. At last he sits at the table, leans his head on his hands, and says that if Smerdyakov, rather than Mitya, is the murderer, he shares Smerdyakov’s guilt because he put him up to it. He immediately qualifies the confession: he does not yet know whether he did so. But he carries the thought to its stark conclusion, declaring that if Smerdyakov is the murderer, then Ivan is a murderer too.

Katerina answers without speaking. She rises, goes to her writing table, opens a box, takes out a sheet of paper, and lays it before Ivan. The gesture gives the scene its material pivot: against Ivan’s uncertain, self-accusing words, she places a written record that appears fixed and definite. The paper is Mitya’s letter to her, written while he was drunk on the very evening he threatened his father.

What Mitya Wrote

The surviving lines of the letter combine farewell, a promise to repay Katerina’s three thousand roubles, and a threat directed at their father. Mitya writes that the next day he will try to obtain the money and repay her; if he cannot borrow it, he will go to his father and break his skull, then take the money from under the pillow, provided Ivan has gone. He also promises to repay Katerina even if doing so means going to Siberia. The threats and promises sit side by side: the letter records both a contemplated act of violence and an insistence that the debt will eventually be paid.

The document’s force comes from its specificity. It names the intended victim, the money, the proposed means of taking it, and the condition involving Ivan’s departure. It is not a confession to a murder already committed; it is a written threat made in advance. But its directness makes it easy for Ivan to treat it as an explanation of the crime, collapsing the difference between a declared intention and proof that its author carried it out.

Ivan’s Reversal

On reading the letter, Ivan becomes convinced that Mitya is the murderer. His reasoning follows the same conditional path as his earlier confession, but now runs in reverse: if Mitya killed their father, Smerdyakov did not; if Smerdyakov did not, then Ivan did not put him up to the murder. The letter thus changes the emotional charge of the scene. Ivan’s admission of possible responsibility gives way to relief and renewed confidence in Mitya’s guilt.

Ivan regards the letter as a logical proof and sees no remaining doubt. He does not consider the possibility that Mitya and Smerdyakov might have committed the murder together; the narrator notes that such a theory does not fit the facts. The episode therefore does not present Ivan’s conclusion as an established account of what happened. It presents his conviction as a response to a compelling document, one that answers his immediate fear while leaving the central question of guilt unresolved.

Aftermath and Significance

The effect continues beyond Katerina’s room. The next morning Ivan thinks of Smerdyakov with contempt, and a few days later he wonders how he could have been so distressed by his suspicions. The paper has not merely altered his view of Mitya; it has changed how he interprets his own recent anguish. What had seemed like evidence of a possible moral entanglement becomes, in his eyes, an error that can be dismissed.

The scene’s dramatic irony rests on the gap between the letter’s evidentiary force and the certainty Ivan draws from it. Mitya’s words make him a plausible suspect, but Ivan’s sudden reassurance reaches further: he treats evidence of a threat as proof of the murder and uses that inference to relieve himself of suspicion. Katerina’s silence and the physical act of presenting the paper sharpen the reversal. A written threat seems to close the case for Ivan just as the possibility of Smerdyakov’s guilt has opened a question he cannot bear to leave unanswered.