From the New York Times–bestselling author of Goosebumps and Fear Street, “a fast and breezy vampire tale punctuated with a few nasty shocks” (Publishers Weekly). Destiny Weller and her twin sister, Livvy, return from their summer vacation with an overpowering thirst—an inhuman desire to drink blood. Have they turned into vampires? How will they keep their horrifying secret from their family and friends? And can they find a way to become human again . . . before it’s too late? “Stine’s many fans will be satisfied.” —School Library Journal