What is the main story used to illustrate the power of Udi in Chapter 34?

The primary story in Chapter 34 that illustrates the glory of Udi is about a doctor from Malegaon whose nephew was suffering from a severe and painful ailment. The text describes how the boy had a bone-cyst, or Hadyavran, which could not be cured by any medical intervention. Despite the efforts of the doctor, his physician friends, and even expert surgeons, all native and foreign treatments failed. As narrated in this chapter, the family, feeling helpless, heard about Sai Baba of Shirdi and decided to seek his help as a last resort, leading them to witness the miraculous power of his Udi.