In her latest novel, White is for Witching (Nan A. Talese / Doubleday), Helen Oyeyemi dismantles and rebuilds the Haunted House story brick by brick, creating a book filled to the rafters with innovation. The Cambridge, UK-based author talked with Neelanjana Banerjee about why she’s drawn to supernatural subjects (but not “magical realism”), why vampire stories are really about race, and how to write stories that will freak your readers out.