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According to P.C. Cast, the concept for the "House of Night" novels came from her agent, who suggested the theme "vampire finishing school." The books take place in an alternative universe version of Tulsa, Oklahoma inhabited by both humans and "vampyres" (Cast uses this alternative spelling in the books, explaining it as a choice she made "just 'cause I like the way it looks"). The protagonist, Zoey Redbird, age 16, is "marked" as a "fledgling" and moves to the "House of Night" school to undergo her transformation.