Mustafa and Ali are working as policemen in Ottoman Empire. Kadi Giyasettin is a well-educated judge who is also giving advices to Ottoman Sultan. The story begins with a conspiracy that was organized against Mustafa and Ali.
Mustafa tries to take revenge from Riza who betrayed him and Ali. Meanwhile Lara Zaharyas, daughter of Boris Zaharyas, meets Mustafa and they fall in love.
Mustafa is following Otto, an assassin who recently came to Istanbul, around before he murders the Ottoman Sultan. But first, he should solve the secret of the Istanbul tunnels.
A serial killer starts to murder people in Istanbul. Mustafa needs to solve the secret of watches that the killer leaves with the victims before more people die.
While Mustafa is working on the watches, he starts to follow Azize around. Meanwhile a assassin starts to murder other Arab sheikhs to bring Sheikh Ebu Felat to power.
Filinta Mustafa chases the murderer called Uzun Tufek who is behind of the murders for to-be-established Ottoman Bank. Lara Zaharyas's life is at danger.
A committee from South America comes to Istanbul to get guns from Boris Zaharyas for their war with North America. A murderer, known as "The Kid", who works for North America starts to kill them one by one in order to prevent this deal.
Filinta Mustafa chases "Map Maker Sifahi" who came to Istanbul from Arabian Peninsula to assassinate the Sultan. Meanwhile, English and French agents are also looking after him to get the maps of water resources in the peninsula.
The manager of the Topkapi Palace library is tortured to death. Kadi Giyaseddin Hatemi charges Filinta Mustafa to solve this murder. Kadi Giyaseddin becomes suspicious of Boris Zaharyas.
Two murders in Istanbul pit Ottoman Empire against Russia. Meanwhile, the famous singer of Germany, Anita von Wilhelm, comes to Istanbul to give a concert.
Filinta Mustafa reveals his own past by the help of Vedad, secret of Hasan who works as a sergeant of Mustafa and secret of Igor, the head of Russian Secret Service, who is coming to Istanbul.
