A child who calls himself Captain Spark. The mysterious Machchli Baba. A stabbing in a dark alley... In Varanasi during the Durga Puja, a valuable statuette of Ganesh is stolen from the famous Ghoshal household. Before he can recover it, Feluda has to face the arch-villain Maganlal Meghraj, solve a murder case, and unmask a fraud sadhu.