A house maid prepares a potion that switches her boss and his son's bodies.

When a boy dies during a cruel prank during gym class, the bullies who victimized him begin to disappear.

Criminal psychologist Dr. Verónica Arizméndi (Edith González) gets the opportunity of a lifetime: A chance to study "The Descuartizador" (Jorge Reynoso), a vicious serial murderer who has gained notoriety thanks to the press and his sadistic crimes.