When the fog clears, the ship is attacked by an unseen band of natives, who fire arrows from the safety of the forest. The African helmsman is killed before Marlow frightens the natives away with the ship's steam whistle. Not long after, Marlow and his companions arrive at Kurtz's Inner Station, expecting to find him dead, but a half-crazed Russian trader, who meets them as they come ashore, assures them that everything is fine and informs them that he is the one who left the wood. The Russian claims that Kurtz has enlarged his mind and cannot be subjected to the same moral judgments as normal people. Apparently, Kurtz has established himself as a god with the natives and has gone on brutal raids in the surrounding territory in search of ivory. The collection of severed heads adorning the fence posts around the station attests to his "methods." The pilgrims bring Kurtz out of the station-house on a stretcher, and a large group of native warriors pours out of the forest and surrounds them. Kurtz speaks to them, and the natives disappear into the woods.
The manager brings Kurtz, who is quite ill, aboard the steamer. A beautiful native woman, apparently Kurtz's mistress, appears on the shore and stares out at the ship. The Russian implies that she is somehow involved with Kurtz and has caused trouble before through her influence over him. The Russian reveals to Marlow, after swearing him to secrecy, that Kurtz had ordered the attack on the steamer to make them believe he was dead in order that they might turn back and leave him to his plans. The Russian then leaves by canoe, fearing the displeasure of the manager. Kurtz disappears in the night, and Marlow goes out in search of him, finding him crawling on all fours toward the native camp. Marlow stops him and convinces him to return to the ship. They set off down the river the next morning, but Kurtz's health is failing fast.