Sawyer is a shy 11-year-old, of other than his cousin Kyle has no friends. When Kyle goes to the military, he is completely alone because. Until he discovered one morning on the beach a dolphin, it has got caught in a fishing net. Sawyer manages, to cut the power, the doctor Dr. Clay Haskett, the Clearwater Marine Hospital operates in close, save the dolphin's life. In the name “Winter” baptized it is the dolphin again soon good, However, he has lost his tail, without this he would not be able to survive in the open sea.

Sawyer befriends not only with winter, also to Clay's daughter Hazel he builds friendships. But then the bad news begin to pile up. Only a storm devastated the maritime station and then returns home from military service wounded Kyle. When Sawyer visits him in the military hospital, where he met the researchers Dr. Know Cameron McCarthy, the specialist in manufacturing prostheses is. Following a sudden impulse, Sawyer asks him, to design a prosthetic tail fin for Winter. Dr. Clay, the production of attempts initially sponsor, However, the money of the Marine Station will soon close, so Dr. Clay is forced, to sell to an investor. Wants to build a luxury hotel on the property, the marine station would razed.