There's a bad smell in Matt and Arlo's apartment building, but the boys can't find the source of the problem. So they devise a plan to solve the mystery of the big stink.
Write a letter to Arlo's mother asking her to change the food she gives him for lunch. Describe the food Arlo likes and the food he doesn't like. Write in a convincing way so the letter will persuade his mother to make these changes.