The Dark Tower is an incomplete manuscript allegedly written by C. S. Lewis that appears to be an unfinished sequel to the science fiction novel, Out of the Silent Planet. Perelandra instead became the second book of Lewis' Space Trilogy, concluded by That Hideous Strength. Walter Hooper, Lewis' literary executor, titled the fragment and published it in the 1977 collection The Dark Tower and Other Stories. Lewis scholar Kathryn Lindskoog challenged the authenticity of the work. For convenience the author of the text is referred to in this article as "Lewis" without qualification. The story... deals with an early rendition of interdimensional travel. A fictional Lewis himself narrates, as he does in Perelandra, but Elwin Ransom appears as a supporting character. The story begins with a discussion of time travel among several academics at a university during summer vacation. They conclude that it is impossible to violate the laws of space-time in such a way. However, after the discussion, one of the men unveils an invention he believes allows people to see through time.
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