This movie is Based on Satyajit Ray's short story ' Feluda &the royal Bengal Mystery'. Feluda aka Pradosh mitter is a famous bengali detective with strong power of observation and intuition. He is invited to Mahitosh Sinha's palace (In bhutan) to solve an old Riddle which leads to the treasure. Being at power with his sharp observation & imagination 'Feluda' tends to replay an old encounter in his head to gather the missing links to the mystery through MIND MAPPING.
The film is precisely my interpretation of the climax of the entire story showing Feluda's process of solving the Riddle.