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Not to be confused with Rule 34. A 2005 novel written by two college students about unraveling the mystery of a 500-year-old (real) book called the Hypnerotomachia Poliphili, with a murder mystery thrown in for good measure. Most of the action occurs at Princeton, which occasionally makes The Rule of Four read like a campus tour guide/campus spirit flier. Nevertheless, it's an enjoyable book for cryptography or history buffs.

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