A book exists that was compiled by a group of people that never worked together at the same time; they always met in pairs, never as a cohesive unit. There were a minimum of four people directly contributing to its creation, but possibly as many as seven or eight were involved, depending on how you want to classify someone as "involved." The book contained all of their observations and the information they had found about this world, as well as their theories about how it works; they wrote it separately from one another, though they shared some of the information between themselves. There are four sections of it, each written by one of those direct contributors; each section was written in that direct contributor's preferred form of cipher. The ciphers aren't unbreakable; with enough patience, all four sections can eventually be read.
Everyone who's taken the book with the intention of breaking all four ciphers and reading the entire thing has been sent home - and not immediately, mind you. They vanished after a reasonable enough length of time for it to be assumed that they managed to read it.
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Everyone who's taken the book with the intention of breaking all four ciphers and reading the entire thing has been sent home - and not immediately, mind you. They vanished after a reasonable enough length of time for it to be assumed that they managed to read it.