RAFO is the common acronym used for saying Read and Find Out. It is used with the implication that the particular question or plot-line for what one wants the answer to, will be revealed in the next, or in a future, book. It is most commonly used for a literary series.

"Read And Find Out. I have grown so used to that answer, that when my wife asks me if I want to go out for dinner this evening, I sometimes say "Read and find out." That's usually when she hits me."
   —Robert Jordan, chat, 1 November 1998
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