Throne of glass UA - Sara Maas

The most fearless of all assassins, Adarlen, is only eighteen. Selene is an outstanding assassin, able to survive in the salt mines where she toiled, and to try to escape from a place that no one has ever managed to get out of alive. In exchange for her freedom, the king allows her to be his a loyal defender, but for that you have to win a competition. Thieves, assassins and warriors from all over the country will compete for honors, a good salary and a chance to be free. But Selena has a significant advantage: she seems to have magic in her blood and despite all the laws of Adarlen intends to take advantage of this, because suffering must finally fight back against its captors. When suddenly the rivals begin to die horrible deaths one by one, Selena's race for freedom turns into a fight for survival, in which she must overcome an unknown evil.