Crown of midnight. Sarah Maas. 2013.

Celaena Sardothien, royal assassin, is the King of Adarlan’s deadliest weapon. She must win her freedom through his enemies’ blood - but she cannot bear to kill for the crown. And every death Celaena fakes, every lie she tells, puts those she loves at risk.

Torn between her two protectors - a captain and a prince - and battling a dark force far greater than the king, Celaena must decide what she will fight for: her liberty, her heart or the fate of a kingdom.........