Speaking and narrative writing

Each evening, a blank envelope appeared under Mariam’s door. On Friday she held one against the light and saw faint pencil marks. They formed a map of the school garden. The next day, she followed it to an old bench and found a box of repaired library books. A note read, “Will you help return them?” The mystery was her brother’s invitation to join his quiet repair project. Clues appear before the solution; the ending explains the envelopes.