FICTION THE NIX by Nathan Hill A Nix can take many forms. In Norwegian folklore, it is a spirit who sometimes appears as a white horse that steals children away. It’s 2011, and Samuel Andresen-Anderson—college professor, stalled writer—has a Nix of his own: his mother, Faye. He hasn’t seen her in decades, not since she abandoned the family when he was a boy. In Nathan Hill’s remarkable first novel, a Nix is anything you love that one day disappears, taking with it a piece of your heart. From the suburban Midwest to New York City to the 1968 riots that rocked…