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A window to the west, a blazing star above
Correct!Out Of The Silent Planet?
Clue #1: “A king’s...” — Ransom, the name of the main character in C.S. Lewis’s book Out Of The Silent Planet.
Clue #2: The bringer of war — The subtitle for “Mars” from Gustav Holst’s The Planets. Mars was the first planet Elwin Ransom visited in the book.