 ALVARITO, a common boy with a perfectly sane brain, suffers a strange chronic stupidity that escapes from modern medicine s limits. FLORENTINA, his poor mother, after years of useless research of a cure, decides to sell their last personal belongings and ask Dr. Natalio (a surgeon-barber with a very bad reputation) for help. Dr. Natalio, hugely well-educated in quackery and medieval surgery, has no doubt about the diagnostic: Alvarito suffers "madness stone" sickness, a stone that pushes the brain and makes the patient act like a stupid. In order to Dr. Natalio, a simple surgery as old as the worlds is will be enough for extract the stone and cure Alvarito, who will become a normal and clever boy.