I still don't get the hint... We already realized before he posted this comment that some kind of
cipher is involved. If he wanted to hint at that, then maybe Caesar, Atbash or Vigenere is involved (according to the description).
story doesn't seem to say much except that it's... a story. And the description of
mystery suggests that there are clues hidden inside the question for
"deducing conclusions" - So maybe there are inconsistencies/paradoxes in the statements?