A young boy named Sawyer Nelson discovers a stranded dolphin caught in a crab trap on a beach in Florida. The injured dolphin, later named Winter, is taken to the Clearwater Marine Hospital where she receives care from Dr. Clay Haskett and his team. Sawyer, despite his struggles at school, forms a special bond with Winter and becomes deeply involved in her rehabilitation. Winter's injuries, however, lead to the loss of her tail, presenting a significant challenge for both her and the marine hospital staff.

As Winter’s condition becomes increasingly complicated, the team at the marine hospital faces mounting pressure to save her. Financial difficulties and further complications arise, putting the future of Winter and the hospital in jeopardy. Sawyer, along with his supportive family and new friends at the hospital, become determined to find a solution, seeking out the expertise of a pioneering prosthetics doctor. Their collective efforts and unwavering dedication to Winter's well-being drive a journey filled with hope, perseverance, and innovation.