This is not explained in the movie. In Stephen King’s novel it’s a scrapbook kept in the basement of The Overlook where Jack does most of his work. It’s what he plans to use as a source for a novel he plans to write on The Overlook.
Click here! Stanley Kubrick adds another obvious reversal to Stephen King’s novel here as Jack is only working on one book; in the novel he is working on two projects 1) a play and 2) planning a novel on the history of The Overlook.
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