Vampires Didn't Exist — K.A. Meng

Fun in the sun turns into a nightmare after a murder. On her first vacation ever, Ivory Ames awakens in the middle of the night to find her best friend missing. She searches the campground and finds Maria lying dead on the beach. With more questions than answers and the police being uncooperative, Ivory decides to find the truth herself. She enlists the help of Maria's other best friend, Harmony Lundy. As Harmony and Ivory search for clues, they learn that someone or something is stalking the campers.