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  • Not the one you're looking for, but this is similar in concept to Piers Anthony's "Split Infinity" trilogy In that case, it's parallel worlds that are fantasy/futuristic sci fi.
    – Stephen R
    Commented Dec 20, 2019 at 16:04
  • 2
    Title made me think of The Subtle Knife, but that doesn't seem to be it. Commented Dec 20, 2019 at 20:31