I need to check if "hiwebxseries.com" is a legitimate source. But since I can't browse the internet, I have to rely on my existing knowledge. Vaidya is a popular web series, so I should recall the plot structure. Episode 4 would likely focus on the second case the protagonist, Dr. Sanjay S. Vaidya, is handling. The first case was the suicide of a student, and the second might involve another mystery, perhaps involving Ayurvedic elements.