El cojo bueno

A young man, Juan Luis Luna, is abducted in Guatemala City and held at the bottom of a rusty, empty underground fuel tank in an abandoned gas station. The kidnappers demand a ransom; his rich father does not reply. The criminals threaten to cut off his son's foot and still hear nothing. They then slice off one of Juan Luis's toes and send it to his father, who still refuses to act. So the next day...