John is a shy and good-natured man who lives in Ceuta and does everything by correspondence, from studying a career or learning judo to getting a girlfriend. She is from Madrid and the time has come for Juan to meet her so he takes a boat to the peninsula. In the boat he coincides with Maria, a beautiful young woman who goes to the capital to study chant and which he had previously met accidentally. During the trip, foreign smugglers try to use John to pass inadvertently stolen diamonds in Tangier.

In Tordesa, a small fishing village in the Spanish Levant, appears a coelacanth, an important fish that in recent years has attracted the attention of the press and scientists around the world. In this village, the only one who realizes the importance of the fish is Julia, who is also aware of the significant rewards that sages offer for the capture. But due to a number of circumstances, the news reaches the head of a scientific institution and they send a delegate to handle the fish. Facing the danger of having the fish removed, Julia hides it aided by his brothers