Number-one New York Times best-selling author Kelley Armstrong has mesmerized fans with her dazzling Otherworld series. Thirteen, the saga's epic conclusion, follows Savannah Levine as she battles the Supernatural Liberation Movement, which aims to reveal the existence of witches, werewolves, vampires, and other supernatural beings to humans. And Savannah is in for a bigger fight than she ever imagined—because now the forces of heaven and hell are joining the fray.