The Seventh Rule of the Dark Tower

Shen Du squatted on the steps at the entrance of the alley, holding a torn book in his hand. The book records all the secrets of Black Tower City - the chief of security's private money, the truth behind the iron gate outside the city, and the meaning of the patrol number. But the weirdest thing about this book is that it can predict tomorrow. The seventh rule of Black Tower City: Don't trust any old book.