Kino and Juana live peacfully near the beach in the Gulf's Water of Mexico in La Paz with their son, Coyotito.
Coyotito gets stung by a scorpion, Juana and Kino quickly go to the doctor who refuses to help them because they're too poor to afford the treatment so Kino goes to the beach and finds a pearl.
People found out quickly he had a pearl and they'd try to take advantage of him, Kino was now afraid of everybody because he didn't know who to trust.
Kino's wife was trying to throw the pearl away out into the sea but Kino caught what she was doing and beat her, Kino ran back to his home only to see it on fire, a man attacks Kino looking like he stole the pearl since Kino couldn't find it anymore and Kino kills the man for defense.
Kino, Juana and Coyotito flee to the North after the crime was done, the trackers follow them to get the pearl and perhaps kill Kino, the trackers accidentally killed coyotito after they thought it was a crying coyote, Kino sneaks up on the trackers in the field and kills all three of them.
Kino and Juana returned to La Paz and throw the pearl back into the sea where it belongs, the music of the pearl slowly drifted away. The pearl surfaces the evil and greedy impulses of everyone that comes into contact with it and thus symbolizes the materialism and selfishness of man's desires.