The only thing sixteen-year-old Mullory Prudence has left of her mom is a warning: "Run if the strange finds you." But mysterious warnings don’t pay the bills or help take care of her sick Gran. And they certainly don’t make her miserable after-school job any more bearable. When unexpected letters start appearing in peculiar places––sealed in bags of dog food and hidden in the refrigerator––Mullory knows she should avoid them to heed her mother’s warning, but her curiosity thinks otherwise. She uncovers an invitation from Stoutmire Estate to compete in a game of Mystery Royale for the chance at a sizable inheritance.