While filming a TV special about dolphins in Mexico, Eliana meets a biologist who warns her of an ecological danger, since the greedy Esquivel has stolen a crystal skull from the deep waters of the ocean. That's the start of a great adventure and a romance with the dolphin trainer.

A real state agency wants to buy and demolish the traditional school Matheus Rose, to use the lot to build a hotel. The proposition unleashes a feel of distrust among the school students and staff, especially with the arrival of new, mysterious students.