It seems that the authentic Gene Wolfe book contains certain recurrent features: it is told in the first person; the narrator is unreliable through choice, inadequacy, or for structural reasons; important facts and features creep into and out of the narrative with a whimper rather than a bang and so forth, among other things. Soldier of Sidon certainly follows this pattern: it takes up the story of Latro (or Lucius), who has previously appeared in Latro in the Mist and Soldier of Arete, who is a capable soldier cursed by waking up each morning with no memory of his life or, indeed, much else.
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