A businessman invites his business partner, classmate and a friend on his 50th birthday. After dinner while the man showing some priceless coins of Jahangir, electricity goes off and later that day the man confirms one of his coin is missing. After one year that business man hires Private Detective P.C. Mitter (Feluda) and those three whom he invited one exact one year before. Then story goes on.—yeasirtalukder