I wish there were more setting books like this on the market. Krevborna picks a theme (Gothic horror) and maintains that focus throughout. The broad outlines of cities and regions are here as well as seeds from which GM's can create all the details they want. While some people use it for 5e, Krevborna could just as easily serve as an imaginary region of a slightly-fantastical 18th-century Eastern Europe. It would work extremely well with Lamentations of the Flame Princess or For Coin & Blood. Any period from medieval to Victorian is possible because of what the author is careful not to emphasize. Of course, the other side of that coin is that GM's will need to do some work to fill-in the blanks. For my part, I'm delighted to have found a setting with big blanks exactly where I want them.