In an upcoming chapter of Shattered there is a real puzzle that I thought I'd post for those who may want to take a crack at solving it....
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"So these letters - they mean something to you Grayson?" Kalani asked staring at the watered pages, pieces missing. I would have to start from the very beginning, they might just be letters, but Coopers dying proclamation was him begging me to remember. Why would he make sure to tell me to remember the letters? They meant something. No, to Cooper they meant everything.
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Clue:
Look up --> Caesar, Atbash and Rail Fence Ciphers
Good luck