Can you tell me the story about Kaka Mahajani's friend who was skeptical of idol worship and his visit to Shirdi?

Certainly. A friend of Kaka Mahajani, who was averse to idol worship and a devotee of the formless, agreed to visit Shirdi out of what is described as 'clinical curiosity.' As detailed in Chapter 35, he set two conditions with Kaka before the trip: he would not bow his head to the saint, and he would not offer any Dakshina. However, upon arriving at the mosque, Sai Baba spoke to him in a voice that was a perfect imitation of his deceased father's. This astonishing event caused the friend to melt inside, forget his resolve, and spontaneously bow at Baba's feet, demonstrating the profound impact of this first encounter.