Demon in the Wood by Leigh Bardugo

Before he became the Darkling, Eryk was just a lonely boy burdened by an extraordinary power. The dangerous truth is that Eryk is not just a Grisha―he is the deadliest and rarest of his kind.

With stunning illustrations and raw emotion, peer into the shadows of the Darkling’s past and discover why he has always been feared by those who wish to destroy him and hunted into hiding his true abilities.

But even in this villain origin story, wicked secrets are destined to reveal themselves . . .