After the death of her mother, a teenage girl moves to the Bahamas to live with her estranged marine-biologist father and befriends a dolphin.

In the deep blue waters of the Bahamas, a handsome tourist becomes involved with a research institute capable of communicating with dolphins. A battle with the U.S. Navy erupts when sonar experiments begin killing the local dolphin population, and with time running out, a close-knit group of friends and family has only one chance to save these intelligent, beautiful creatures from destruction.