Foul Days by Genoveva Dimova

Genoveva Dimova has written a smart, captivating fantasy that borrows heavily from Russian/Slavic mythology.

Witch Kosara bargains away her shadow and must go on a quest to get it back before shadow sickness overwhelms her. Her quest will lead her to a way to save her city and get revenge on her powerful ex-lover.

I really liked this and will be looking for the conclusion to the duology. I’d recommend this to mid-teens and up, there’s some fairly adult themes but nothing terribly overt.