The fourth chapter of Coetzee's novel, Foe, is the ending chapter and probably the most complex. The chapter starts with the short sentence "The stair case is dark and mean", that immediately reminds something to the careful reader. As a matter of fact the fourth chapter starts with the same sentence of the third chapter, but with a small significant difference. In the third chapter the simple past is used ("The stair case was dark and mean"). This means that the reader wants to mainly involve the reader in the description. But are we sure that the narrative voice is Susan Barton's?

No, we aren't, and we discover this when the narrator said: "They lie side by side in bed". The two persons in the bed were Susan and Foe. If we have still douts the narrator continues: "Susan Barton and her dead captain in..." There is an unknown narrator. The first person narration affects the reader's expectations because it doesn't give him the possibility to see the narration from a different prospective.
In this chapter the main characters are sleeping, or better they are dreaming. What all characters are doing is not important, we have only to focuses our attention on Friday. He's dreaming the island and has the narrator say: "from his mouth without a breath, issue the sound of the island". Then there is a break in narration.
Narration starts again with the narrative voice "fall in the book" written by Foe, where he finds Friday in the sea of the island where Susan, Robinson and Friday were shipwrecked. At the end of the novel he finally speaks. But this is not a simple end. Coetzee wants to show that a re-writing of a novel, does not simply offer a new version of past, but it may cause us to question what made the past happen. From Coetzee's point of view the past must be written and rewritten, because if not it may be forgotten, and it's the only way to express reality. As a matter of fact you have different truths from different prospectives.