Synopsis - The aquantic chase lasts throughout the night. Ransom observes human-like beings in the water which have nothing to do with either him or the King and Queen of Perelandra. Eventualy Ramsom falls asleep. He awakes to find only his fish and the Un-Man's floating on the vast empty sea. The Un-Man attempts to get Ransom's attention. Ransom ignores him beliving it to be simply annoyance. But as the form that was Weston continues talking, Ransom wonders if the real Weston has returned of if it's just a demonic deception
This is the most "Screwtapian" chapter of the book. Despair and doubt fill Ransom's mind as the chase comes to a close. Ransom's observations of the humanoid underwater dwellers causes him to question whether or not there is any purpose to his voyage to another planet. Tasting the seaweed has caused him to view his place on the planet differently.
The real Screwtape touch comes when Ransom's fish catches up with that of the Un-Man. Once again he calls out Ransom's name over and over. Yet there is something different about the voice. Could it be that the original Weston has returned to his body? Or is it just a ruse to gain Ransom's confidence? Does it really matter who is talking to Ransom if Weston has become a devil himself?
Weston gains Ransom's cautious attention because he has no memory of what has happened on Perelandra. Only a fear of "it", which he can not explain. Weston then goes on to spin a tale about how all our old superstitions about death are justified, something quite un-Westonlike. This causes Ransom to ask him "who are you?". Weston goes on with more talk about how the dead sink into "the rind" of time after they die. Ramsom points out to Weston that he never belived in God. And Weston quotes the Bible saying that "He's a God of the living, not of the dead". This is a diabolic twisting of meaning. In the book of Matthew, chapter 22 verse 32, it says "God is not the God of the dead, but of the living" meaning that in God's eyes everyone who has ever lived remains alive in His vision. Weston has twisted this verse to suit his own ends, to cause Ransom to fall into despair. And he comes close to doing so.
But Ransom will not let him get away with this ploy. Weston goes on to talk about a dream he had about being laid out for a funeral after his own death. Along comes a rotting corpse to warn him about the decay that awaits him in the grave. Finally enough is enough! All Ransom can do is yell "Shut up" at the wreck of his old nemisis. Around them the sea swells with breakers and Weston succeeds in dragging Ransom down physicaly into the deep water after failing to bring down his faith.