The Logo for Lesson 18 is a "Calavera"

Question 18 SA-14. Here is the text reference (p. 177/1):

This theme is the basis for the story which follows: Juan Pablo is a humble representative of the masses who, due to circumstances and personal courage, becomes a revolutionary general and leader. But the corrupt politicians who began to control the Revolution after the fighting phase was over betrayed him and finally executed him because they could not tolerate his honesty and his firm loyalty to the ideals of the Revolution.