While playing at a lake, Nina is attacked by a gang of thugs and pushed under water - according to the doctor's diagnosis, the eleven-year-old is physically perfectly healthy, but has suffered severe trauma. After her parents Claire and Daniel have consulted several psychologists, dolphin therapy seems to be the only promising method of treatment. The whole family flies to a therapy center in Florida. Nina actually makes contact with the dolphin Domino, a notorious loner. When Nina observes how Domino is lured into the open sea by fishermen at night, the sick girl surpasses herself.