The team of people who saved Winter's life reassemble in the wake of her surrogate mother's passing in order to find her a companion so she can remain at the Clearwater Marine Aquarium.
It's 1949 Los Angeles, the city is run by gangsters and a malicious mobster, Mickey Cohen. Determined to end the corruption, John O'Mara assembles a team of cops, ready to take down the ruthless leader and restore peace to the city.
A boy finds a dolphin that was injured in a trap. They become friends, but the dolphin needs to have its tail amputated to survive. With the help of a biologist and a prosthetics specialist, the boy tries to save the animal.