Six of Crows

Blurb from SLJ

Fast-paced and unpredictable, this Bardugo fantasy (she is battling herself in this year's MMTOB) will be a hit with readers who love dark fantasy. 

Orphans and childhood friends Alina and Mal are tested for magical abilities early in life. Not wanting to be separated from her only friend, Alina manages to hide her powers and grows into her teen years, unnoticed and unremarkable. But when she and Mal must cross the perilous Shadow Fold as army soldiers, Alina uses her dormant powers to save Mal's life. 

After that episode, Alina is revealed to be a "Sun Summoner," a person who can bring forth light and maybe destroy the Shadow Fold for good. She's whisked away to train as a Grisha, a group whose varied powers assist the royal court. There, she begins to understand her incredible abilities with the help of the ancient and powerful Darkling, "a man second in power only to the King," who leads Alina to believe that she can bring peace to their divided country. 

In this first of a dulogoy, Bardugo creates a unique world complete with monsters, magic, danger, romance, corruption, and extravagance. In the world of the Grisha, few things are as they seem, and wondering who Alina should trust—and if she can even trust herself—adds to the intrigue.