What is the primary story introduced in Chapter 41, and who is the person telling it?

Chapter 41 introduces a miraculous story about how a physical portrait of Sai Baba arrived at the narrator's house at the perfect moment. As detailed in the chapter, this event fulfilled a dream in which Sai had promised, "On a Holi festival day, I am coming to your house for a meal today." The story of how the photo was acquired and delivered is told by a man named Alli Mohammed. Chapter 41 explains that Alli brought the photo right when the narrator was about to have lunch on Holi, which is described as a humorous and clear Leela or divine play.