What is the story of the doctor from Malegaon and his nephew's illness as described in Chapter 34?

Chapter 34 narrates the story of a degree-holding doctor from Malegaon whose nephew suffered from a severe bone-cyst, also known as Hadyavarn. Despite the doctor's own expertise and consultations with other physicians and expert surgeons, no native or foreign treatments, including surgery, could cure the painful ailment. The young nephew was suffering greatly, and his relatives were worried. After exhausting all medical options, the family heard about the great saint Sai Maharaj of Shirdi and decided to seek his help as a last resort, hoping his Udi could avert the calamity.