Davood Inchi Code

“... Rambod Langaan found the dead body on the floor. He couldn’t see clearly in that dark, but he could definitely recognize the smell. The body should have been there for a few days. Holding his breath, he got closer and reached the bag. It was wet.
As soon as he got out of the tunnel, he filled his lungs with fresh air. Now he could think more clearly. The bag was wet; not from the water in the tunnel, but from the blood. His body shivered. He had no choice. Without any further thoughts, he opened the bag and immediately found what he was looking for: an old piece of parchment. He couldn’t believe what he was seeing. Those were the exact same notes that Davood Inchi wrote more than a thousand years ago. They were the rules of their underground society, called Folan, but they were what all people thought. Rambod knew more than those. This was actually an encrypted message for those who were really a part of Folan, the location of their secret gatherings. Taking out the characters at Fibonacci indices and putting them together would reveal the message. That was easy for Rambod. He wrote the first, second, third, fifth and eighth characters out and wrote them on his hand; “Thefsl” was what he had on his hand! What could that possibly mean? The sentence on the parchment started with “The first rule”. “This cannot be right” he thought. He tried more letters but suddenly he reached the end of the parchment. But there were not enough letters. So he continued backwards through the text. He reached the beginning of the text, reversed the direction and continued picking toward the end of the text. He couldn’t do this forever. He had no time. There was someone out there killing people... ”