This was a fantastic fantasy world of monsters, magic, and mayhem. Wonderfully Rick of Slavik lore, and reminiscent of fairy tale folklore, Foul Days was a fast-paced novel.
Kosara is preparing for the Foul Days like every three year - warding against the Zmey, as he has chased her every year since she escaped his palace. The Foul Days happen every year on this side of the wall, for twelve days, monsters roam free in the city. The wall keeps them from going across to the other side, keeping the humans safe.
When Kosara is faced with the Zmey early, a bargain with a stranger sets a series of events in motion that leads to her not only losing her shadow but being stuck on the other side of the wall. Murderer and mayhem follow, and she's found herself working with a policeman named Asen.
As Kasara and Asen work to find a killer, they get to know one another and become partners. Through danger and deceit, this team investigates what they can about the murder, as well as why the wall doesn't work as it was intended to. But can they fix it?