Who is the author of short story ' The mysterious treasure'

 The friends found a strange old map under the bed. It was really old and there were so many dust on it. So they cleaned it with a piece of cloth. But there wasn't anything on the paper. Then  they had a chat together because they met after a long time. While they were chatting one of friends drew something on that paper with a pencil. suddenly there appeared some letters on the pencil drawn lines . Then they coloured the whole paper . They were so delighted and one of friends got  fainted when he looked it. It was a route to a treasure and according to the map it wasn't very  far from their house. So they decided to find it . On other day they set out  without telling anyone. Finally they found a big rock and they started to dig up according to the map . After that they found  a  box. Then they opened it and took the paper which was in it. It was a letter from their brother. They had made a jok for them. Then the friends got really angry with their brothers. So the friends decided to do a very bad jok for them also.