Jody McGrath and her family are sailing around the world researching dolphins, and Jody records all their exciting adventures in her Dolphin Diaries. In the series' fifth book, Jody and the crew arrive in the Caribbean and make a new dolphin friend, Frida. But other dolphins there have been captured and taken to live in dirty, unhealthy conditions, just to entertain tourists! Jody is outraged. Can she help win freedom for these dolphins?