Barnes & Noble exclusive edition contains a fold-out poster and annotated chapter (17 Nikolai) in the back of the book.

No one knows what Nikolai Lantsov endured in his country's bloody civil war. Now enemies gather at his weakened borders, and the young king must find a way to refill Ravka's coffers, forge new alliances, and stop a rising threat to the once-great Grisha Army. Zoya Nazyalensky is devoted to rebuilding the army -- but she also has enemies to conquer. Nina Zenik wages her own war to save the Grisha -- and must face the pain of her past. As a dark magic within Nikolai grows stronger, he must journey where the deepest magic survives -- and vanquish the terrible legacy inside him. -- adapted from jacket