Nikhil and his family have just moved to Dehradun, a small valley town in India. In Dehradun, Nikhil meets a group of children, roughly of his own age – Ishaan, Neha, Shreya, and Arjun. There’s a circus in town, but when the group visits the circus, events take a strange turn. They get tangled up in a series of robberies and begin to suspect that someone from the circus is responsible. The children form the Private Investigators (PI) Club to investigate