Although I haven't seen it, I gather from reviews that the murderer(s) set it up to be unsolvable, kind of like a paint by number approach to murder...
They called it that because the guys that commit the murder in the movie do it "by the book" or "by the numbers" according to how murders are investigated as far as investigation and forensic clues go (or at least that's how they wanted it to appear to the investigators).
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