 They also find the thief who had stolen a stone collected from the moon's surface by U.S. Astronauts.Raja Roychoudury or Kakababu (as he is better known), the crippled adventurous man and his nephew Santu and his friend Jojo become involved by chance in the case of ‘Ek Tukro Chand’.It seems as if a few pieces of stone or the ‘moon’ are being exhibited at museums all over the world.