Mandy's been spending most of her Florida vacation at the local animal park, playing with two tame dolphins, Bob and Bing. The dolphins are happy performing together but when Bob dies, Bing seems lonely and depressed. Mandy and her friend, Joel, worry about Bing's future. But then they come up with a daring plan to set him free. Can Mandy and Joel help the lonely dolphin . . . before it's too late?