In this volume, large parts are devoted to the trial of Dmitri's suspicion of the murder of his father, Fyodor.
Contrary to the previous volume, people other than Dmitri play active roles.
Ivan, who hears the truth from the real murderer Smerdyakov, struggles with a guilty feeling that he may have wanted his father's death and helped the murder indirectly. He finally loses his mind.
Katerina, who is determined to be faithful to Dmitri before the trial, suddenly betrays him because of her love to Ivan and confesses the existence of a letter, which Ivan calls "mathematical proof of Dmitri's murder."
When I read her confession, I feel how complex human mind is.
The fierce debate between a prosecutor Ippolit and a noted attorney Fetyukovich is eye-opening and it is because of this part that we can say the novel is also read as a legal thriller.