Jody McGrath's dolphin dreams are coming true! Her whole family is sailing around the world researching dolphins - and Jody is recording all their exciting adventures in her diary!

In the Marquesas Islands in Polynesia, Jody is delighted to spot a large mixed group of spotted and spinner dolphins - especially one she names Twister. On the islands, she meets two new friends, Lew and Monique, who work for a local dolphin-friendly tuna boat. Jody has the chance to witness them in action as they save dolphins. But when something goes wrong with Monique's breathing equipment at the last minute