Basically the book begins with talking about the usage of these signs and their usual placement and how the practice began of leaving shadow Marks. From there, the book is a glossary of signs to look out for and their meaning. I mean if you look at even barrels, there are some marked with a signia identifying them as a thief cache, marks identifying random places throughout the Region as safe or dangerous, etc. A great though paid to detail in the game for certain.
I do however feel that while this is a great addition to the game that Bethesda could have exploited this and given the players who go down the path of the Thieves' Guild a chance to utilize in mission. For example( and this is just off the top of my head), in the SUmmerset SHadows mission, they could have done in a manner similar to the trailing and killing of Gaius Maro. It would have been cooler if Niranye had knowledge of Linwe's movements, but did not know where the guild was holed up; so you would have to get to a location by a certain day and time, place a signia on a building(a fort or ruin or something) identifying it is a place that houses considerable wealth thus luring him in. At the point, you have to sneak about, kill some draugrs or sneak by them as Linwe has done, track him down, kill him, and then loot him for everything including a map of the location of their hideout. Then you can go their and optionally destroy the banner. Just thinking off the top of the head.
What do the rest of you guys think about this? Did you guys also find the book and feel although it did add a great element to the game that it could have been explored more and players given the opportunity to use it? Or even like in FO3, how you could bring map updates to RIley of the Rangers and get money for it, you could make extra coin by discovering and marking places of wealth, danger, etc, for the Guild and make some coin(as Delvin is found of saying).
