The mystery that is introduced and solved in "Las Uvas: Grapes" by Miguel's message is:
The present that he gives Miguel - Abuelita. Abuelita is Miguel's grandmother.
Esperanza is worried about the people at the shed because more and more people arrive willing to work for less and less money.
Miguel would rather dig ditches rather than confront his boss because is is not sure how that will turn out. Miguel on the other hand wants him to confront his boss with the demand to be treated better.
Esperanza is angry with Miguel because he lost his job at the railroad.
Miguel leaves the camp suddenly because he feels that Esperanza was mean to him.
See more exercises about Abuelita at:
https://brainly.com/question/21952831