Twenty-five of the scariest horror books

At B&N Reads Jeff Somers tagged "twenty-five books that might not necessarily be the best horror novels, but are certainly the scariest," including:
Rosemary’s Baby, by Ira Levin

The film adaptation has supplanted the novel in pop culture, but the novel was a huge hit for Levin—and the film actually sticks to the plot and dialog so closely you really do get a feel for the novel from watching it.