Enjoying the Caribbean, Jody and her family meet Luisa, a dolphin researcher from Mexico, who has a particular concern for cruelty to dolphins in her country. Telling Jody and her mum, Gina, about the risk to the dolphins, particularly Luisa's special dolphin, Frida, Luisa is anxious to get home and be with Frida again, but she also needs to check out reports of dolphins being 'kidnapped' and used to entertain tourists in swanky hotel resorts. Kept in dirty, unhygienic swimming pools, the poor creatures are trapped and lonely. Jody is horrified, and she and Gina fly back to Mexico with Luisa, to try and rescue the dolphins! But how can they prove that what's happening is against the law? With the help of Jody's new friend, Carmelita, Jody, Gina and Luisa free the captive dolphins, and Luisa is reunited with her beloved Frida once more.