Who would have thought the notoriously spooky little town of Nightshade, California, could get twice as weird? The summer before Daisy Giordano's senior year, it does. With their mom working on a case overseas, the Giordano sisters are on their own. These smart psychic teens have no trouble taking care of themselves. They score jobs: Daisy starts working at her favorite diner, Slim's; beach-loving Poppy mans a snack stand on the boardwalk; and Rose lands a coveted position as a research assistant to the mysterious Dr. Franken. But then summer gets strange. Residents of Nightshade are suddenly seeing double. Doppelgangers -- look-alikes of familiar friends and neighbors -- are popping up all over town. Daisy, Rose, and Poppy think it's a coincidence, until the rumors start that their father, who disappeared several years ago, is back in Nightshade. Perhaps the girls won't be having a parent-free summer after all. Meanwhile, Daisy's boyfriend, Ryan, is spending all of his time training for football, and like the other guys on the team, he's grown enormous almost overnight. Could the players be resorting to extreme measures to win? Between psychic predictions, sugar rushes, and beach parties, the Giordano sisters get to the bottom of these mysteries and more.