I Have a Book of the Old World

On the first day he traveled through time and became a detective, he received a book that could write on its own. The pages of the book appeared: in the last round of civilization, thirteen people disappeared on the same street. And the case he took over happened to be the fourteenth. The restricted area in the old city, the hot black powder, and the cult calling itself "Ashes". The whole city is hiding one thing from him: this book knows him. He also wanted to know why his name was in the records of the previous round.