Ambar Sen Antordhan Rahasyo(অম্বর সেন অন্তর্ধান রহস্য)

Ambar Sen a well educated, intelligent man with a good depth of knowledge on different subjects came to Feluda for a case. Anyone or any group threatened Amber babu a few days ago. The very next day Ambar Sen vanished. Ambuj Sen the only brother of Ambar babu called Feluda for the case. Feluda, Tposey, and Jotayu came to Palm Avenue's Sen House to solve the case.