While swimming free in the ocean, a young dolphin gets caught in a trap and severely damages her tail. Though she is rescued and transported to Clearwater Marine Hospital, her tail cannot be saved, and the prognosis is dire. What the dolphin, now named Winter, needs is a miracle. She gets that miracle in the form of a marine biologist (Harry Connick Jr.), a prosthetics designer (Morgan Freeman), and a devoted boy (Nathan Gamble), who find a way to help Winter swim again.