Ippolit opens his treatise on Smerdyakov by asking where the suspicion came from. The first accuser was Mitya at arrest, yet he has never offered a fact to confirm it. Ivan voiced guilt only today under brain fever, though for two months he shared the prosecution's view. Alyosha admits he has no fact, only Mitya's words and face. Grushenka says believe the prisoner because he does not lie. That is all the evidence from people bound to Mitya's fate, yet the theory persists. Is it credible? Is it conceivable?
He paints Smerdyakov as weak-minded, epileptic, an epileptic chicken terrorized into spying: he kissed Mitya's feet, revealed envelope and signals from fear of being killed, fainted when Ivan left Moscow. Doctors say epileptics torment themselves with guilt; Smerdyakov was driven by intimidation. Alone he would never have told a rival about the money; as sole killer he would have taken the envelope, not left it torn beside the corpse. As accomplice the sham fit, double murder, and timing are absurd. Even passive consent makes Dmitri the instigator. Mitya now says Smerdyakov did it alone, a strange accomplice who accuses his partner at once.
The suicide note says he destroys himself of his own will to throw no blame on anyone, without confessing parricide. Returned notes and Ivan's delayed report invite brain-fever conjecture: Ivan imagined Smerdyakov's confession to save his brother. Ippolit sets psychology aside and returns to facts and Dmitri's letter program.
The murder followed that program. Mitya did not timidly retreat from the window; he entered, killed in rage, searched for Grushenka, tore open the envelope like reclaiming stolen property, and left the torn cover as evidence a careful thief would not. He struck Grigory with the pestle, checked whether the witness lived, ignored his blood, and ran to find Grushenka had gone to Mokroe. Every alternate exit closed; Mitya alone remains in the prosecutor's story.
Coming Up in Chapter 88
Ippolit closes with Grushenka's first lover and Mitya's planned suicide feast at Mokroe, then invokes Russia's fatal troika galloping toward destruction while Europe watches in horror before the court adjourns and Fetyukovitch mounts the tribune.