Can you describe the event that made the narrator question his trip to Shirdi and his belief in Gurus?

According to Chapter 2, the narrator's plan to visit Shirdi was derailed by a tragic event involving a close friend. This friend, who was the son of a Guru, was in Lonavala when his own healthy and virtuous son was suddenly struck with a fever and died. This happened even though all human remedies were tried and the grandfather, a Guru, was brought to sit near the boy. Seeing this, the narrator's mind became very restless and his interest in seeing Sai Baba slackened, as he questioned the benefit of a Guru's company if they couldn't even save an only son from such a crisis, which he attributed to the power of past karma.