As we learned in Book 7, Chapter 3, Grushenka told Dmitri that she was off to help Samsonov with his accounts.
The narrative picks up with Dmitri, who leaves Grushenka and tries desperately to find some money. He pawns off his shooting pistols with a casual friend, a young official in town.
Dmitri then goes off to visit his father's neighbor, Maria Kondatrievna, where he is distressed to learn that Smerdyakov has fallen ill.
Dmitri heads home, worried. He washes up, gets dressed, and decides to borrow the 3,000 roubles he needs from Madame Khokhlakov.
Dmitri arrives at Madame Khokhlakov's, who is, strangely, thrilled to see him. He keeps trying to ask her for the 3,000 roubles, and eventually succeeds – or so he thinks. But Madame Khokhlakov really is just trying to get him to work with the gold mines, where he would, eventually, earn 3,000 roubles. She drapes a small silver icon around his neck as a kind of good-luck charm.
Dmitri, furious and impatient with Madame Khokhlakov's incoherent plans, bangs his fists on the table, spits, and walks out the door.
Outside Dmitri dissolves into hopeless tears as he beats himself on a certain spot on his chest, the same spot he had beaten when he talked previously with Alyosha in Book 3, Chapter 11.
Grief-stricken, he wanders into the square, where he encounters an old woman whom he recognizes as a servant of Samsonov. When he asks her about Grushenka, he discovers that Grushenka had left Samsonov's shortly after he dropped her off.
Furious, he heads to Grushenka, where he discovers from her servant Fenya that she has just recently left for Mokroye. On the way out, he takes a brass pestle from the table and stuffs it in his pocket.