In the estuary of Laguna, in the south of Brazil, there is a special group of Dolphins that are known to help the fishermen catch their favorite fish, mullet. The fishermen call them “The Good Dolphins” and they have been working together for the last 150 years. This long-standing relationship is now under threat as the dolphin population is getting smaller and dying out. What used to be a group of 50 dolphins, is now down to 25. Pollution, illegal fishing nets, and Jet skis are threatening this special relationship, and it is up to the fishermen to fight back and try to save their co-workers. Through the eyes of the fisherman, the viewer is immersed in their fight against extinction, and the unique friendship they share with the dolphins.