Fetyukovich next tackles the question of the money. To put it bluntly, where is it? No one, Fetyukovich points out, can confirm actually having seen Fyodor Karamazov put the money in the so-called envelope. If the money never existed, then Dmitri couldn't have stolen it. Fetyukovich dismisses Kirillovich's conjecture that Dmitri hid it in some secret crevice in the inn as pure fantasy.
Fetyukovich then explains Katerina's conflicting testimony as the impulsive utterances of a vengeful woman. This is kind of clever, because if someone as well-respected as Katerina can be both lofty and petty at the same time, Dmitri, too, can have contradictory impulses toward both honor and utter disgracefulness.
On the question of Katerina's letter, Fetyukovich points out how closely Dmitri's words about the envelope echo the way that Smerdyakov talks about the letter, suggesting that Dmitri, like everyone else, only knew about the money secondhand, from Smerdyakov.