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?