Nancy Drew and her friend George Bess win a vacation to an eco-resort in Costa Rica. But after a string of increasingly dangerous "accidents," it seems that there is a jealous predator staying at the resort, making trouble for the management and the guests. Against the urging of her friends, Nancy takes on the case to get to the bottom of it before the entire week at Casa Verde is ruined -- or worse. Can she uncover who is sabotaging the resort before it's too late? Or will their vacation come to an unhappy end?