Synopsis from Goodreads

When Sam's dad whisks him and his brother off to a remote beach town for the summer, he's all for it-- at first. Sam soon realizes, though, that this place is anything but ordinary. Time seems to slow down around here, and everywhere he looks, there are beautiful blond girls. Girls who seem inexplicably drawn to him. Then Sam meets DeeDee, one of the Girls, and she's different from the others. Just as he starts to fall for her, she pulls away, leaving him more confused than ever. He knows that if he's going to get her back, he'll have to uncover the secret of this beach and the girls who live here.